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Real Estate and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost $ 2,098,335    
Buildings & Improvements, Initial Cost 5,327,191    
Improvements, Initial Cost 7,203    
Land, Total Cost 2,154,968    
Buildings & Improvements, Total Cost 6,484,143    
Total Cost 8,639,111    
Accumulated Depreciation 1,670,717    
Total Cost, Net of Accumulated Depreciation 6,968,394    
Encumbrances 1,246,938    
The changes in Total Real Estate Assets, excluding real estate held for sale, for the three years ended December 31, 2012 are as follows:      
Balance, beginning of year 8,266,839 8,411,239 8,812,484
Acquisitions and transfers from joint ventures 594,633 260,161 0
Developments, improvements and expansions 105,132 104,245 174,315
Changes in land under development and construction in progress 3,188 (15,153) (2,409)
Real estate held for sale 0 (3,267) 0
Adjustment of property carrying values (135,813) (125,844) (171,900)
Sales, transfers to joint ventures and retirements (194,868) (364,542) (401,251)
Balance, end of year 8,639,111 8,266,839 8,411,239
The changes in Accumulated Depreciation and Amortization, excluding real estate held for sale, for the three years ended December 31, 2012 are as follows:      
Balance, beginning of year 1,550,066 1,452,112 1,332,534
Depreciation for year 233,619 230,332 227,304
Real estate held for sale 0 (977) 0
Sales and retirements (112,968) (131,401) (107,726)
Balance, end of year 1,670,717 1,550,066 1,452,112
Sterling, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,426    
Buildings & Improvements, Initial Cost 18,651    
Improvements, Initial Cost 0    
Land, Total Cost 8,426    
Buildings & Improvements, Total Cost 18,689    
Total Cost 27,115    
Accumulated Depreciation 3,532    
Total Cost, Net of Accumulated Depreciation 23,583    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Windsor Court, CT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,090    
Buildings & Improvements, Initial Cost 11,745    
Improvements, Initial Cost 0    
Land, Total Cost 6,090    
Buildings & Improvements, Total Cost 11,749    
Total Cost 17,839    
Accumulated Depreciation 2,230    
Total Cost, Net of Accumulated Depreciation 15,609    
Encumbrances 7,096    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Ocala, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,877    
Buildings & Improvements, Initial Cost 9,407    
Improvements, Initial Cost 0    
Land, Total Cost 853    
Buildings & Improvements, Total Cost 4,475    
Total Cost 5,328    
Accumulated Depreciation 1,796    
Total Cost, Net of Accumulated Depreciation 3,532    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Valrico, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,282    
Buildings & Improvements, Initial Cost 12,190    
Improvements, Initial Cost 0    
Land, Total Cost 3,282    
Buildings & Improvements, Total Cost 15,031    
Total Cost 18,313    
Accumulated Depreciation 2,334    
Total Cost, Net of Accumulated Depreciation 15,979    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Atlanta, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,120    
Buildings & Improvements, Initial Cost 31,341    
Improvements, Initial Cost 0    
Land, Total Cost 11,120    
Buildings & Improvements, Total Cost 32,982    
Total Cost 44,102    
Accumulated Depreciation 6,142    
Total Cost, Net of Accumulated Depreciation 37,960    
Encumbrances 11,796    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Norcross, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,007    
Buildings & Improvements, Initial Cost 8,489    
Improvements, Initial Cost 0    
Land, Total Cost 3,007    
Buildings & Improvements, Total Cost 8,535    
Total Cost 11,542    
Accumulated Depreciation 1,609    
Total Cost, Net of Accumulated Depreciation 9,933    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Bowie, MD [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,739    
Buildings & Improvements, Initial Cost 14,301    
Improvements, Initial Cost 0    
Land, Total Cost 5,744    
Buildings & Improvements, Total Cost 14,402    
Total Cost 20,146    
Accumulated Depreciation 2,770    
Total Cost, Net of Accumulated Depreciation 17,376    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Ashville, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,651    
Buildings & Improvements, Initial Cost 8,908    
Improvements, Initial Cost 0    
Land, Total Cost 2,651    
Buildings & Improvements, Total Cost 9,032    
Total Cost 11,683    
Accumulated Depreciation 1,943    
Total Cost, Net of Accumulated Depreciation 9,740    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Charlotte, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,842    
Buildings & Improvements, Initial Cost 9,807    
Improvements, Initial Cost 0    
Land, Total Cost 2,842    
Buildings & Improvements, Total Cost 10,025    
Total Cost 12,867    
Accumulated Depreciation 1,909    
Total Cost, Net of Accumulated Depreciation 10,958    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Cornelius, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,382    
Buildings & Improvements, Initial Cost 15,184    
Improvements, Initial Cost 0    
Land, Total Cost 4,382    
Buildings & Improvements, Total Cost 18,661    
Total Cost 23,043    
Accumulated Depreciation 4,027    
Total Cost, Net of Accumulated Depreciation 19,016    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Greensboro, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,682    
Buildings & Improvements, Initial Cost 7,593    
Improvements, Initial Cost 0    
Land, Total Cost 1,682    
Buildings & Improvements, Total Cost 7,654    
Total Cost 9,336    
Accumulated Depreciation 1,861    
Total Cost, Net of Accumulated Depreciation 7,475    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Raleigh, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,728    
Buildings & Improvements, Initial Cost 10,665    
Improvements, Initial Cost 0    
Land, Total Cost 2,728    
Buildings & Improvements, Total Cost 10,817    
Total Cost 13,545    
Accumulated Depreciation 2,054    
Total Cost, Net of Accumulated Depreciation 11,491    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Wilson, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,598    
Buildings & Improvements, Initial Cost 8,160    
Improvements, Initial Cost 0    
Land, Total Cost 1,635    
Buildings & Improvements, Total Cost 9,110    
Total Cost 10,745    
Accumulated Depreciation 1,749    
Total Cost, Net of Accumulated Depreciation 8,996    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Morgantown, WV [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,645    
Buildings & Improvements, Initial Cost 10,341    
Improvements, Initial Cost 0    
Land, Total Cost 4,645    
Buildings & Improvements, Total Cost 10,425    
Total Cost 15,070    
Accumulated Depreciation 2,130    
Total Cost, Net of Accumulated Depreciation 12,940    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Edgewater, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,714    
Buildings & Improvements, Initial Cost 30,473    
Improvements, Initial Cost 0    
Land, Total Cost 7,714    
Buildings & Improvements, Total Cost 30,855    
Total Cost 38,569    
Accumulated Depreciation 5,786    
Total Cost, Net of Accumulated Depreciation 32,783    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Highland Ranch, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,380    
Buildings & Improvements, Initial Cost 4,682    
Improvements, Initial Cost 0    
Land, Total Cost 1,380    
Buildings & Improvements, Total Cost 4,838    
Total Cost 6,218    
Accumulated Depreciation 872    
Total Cost, Net of Accumulated Depreciation 5,346    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Dania Beach, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,593    
Buildings & Improvements, Initial Cost 17,686    
Improvements, Initial Cost 0    
Land, Total Cost 9,593    
Buildings & Improvements, Total Cost 17,691    
Total Cost 27,284    
Accumulated Depreciation 3,416    
Total Cost, Net of Accumulated Depreciation 23,868    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Plantation, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 21,729    
Buildings & Improvements, Initial Cost 37,331    
Improvements, Initial Cost 0    
Land, Total Cost 22,112    
Buildings & Improvements, Total Cost 93,830    
Total Cost 115,942    
Accumulated Depreciation 15,458    
Total Cost, Net of Accumulated Depreciation 100,484    
Encumbrances 45,800    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Duluth, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 815    
Buildings & Improvements, Initial Cost 2,692    
Improvements, Initial Cost 0    
Land, Total Cost 545    
Buildings & Improvements, Total Cost 2,094    
Total Cost 2,639    
Accumulated Depreciation 644    
Total Cost, Net of Accumulated Depreciation 1,995    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Lawrenceville, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,457    
Buildings & Improvements, Initial Cost 1,057    
Improvements, Initial Cost 0    
Land, Total Cost 1,486    
Buildings & Improvements, Total Cost 1,146    
Total Cost 2,632    
Accumulated Depreciation 219    
Total Cost, Net of Accumulated Depreciation 2,413    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Rome, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,523    
Buildings & Improvements, Initial Cost 4,007    
Improvements, Initial Cost 0    
Land, Total Cost 1,523    
Buildings & Improvements, Total Cost 4,966    
Total Cost 6,489    
Accumulated Depreciation 754    
Total Cost, Net of Accumulated Depreciation 5,735    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Snellville, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,303    
Buildings & Improvements, Initial Cost 1,494    
Improvements, Initial Cost 0    
Land, Total Cost 1,303    
Buildings & Improvements, Total Cost 1,494    
Total Cost 2,797    
Accumulated Depreciation 285    
Total Cost, Net of Accumulated Depreciation 2,512    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Sylvania, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 431    
Buildings & Improvements, Initial Cost 3,774    
Improvements, Initial Cost 0    
Land, Total Cost 431    
Buildings & Improvements, Total Cost 3,774    
Total Cost 4,205    
Accumulated Depreciation 747    
Total Cost, Net of Accumulated Depreciation 3,458    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Worcester, MA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,395    
Buildings & Improvements, Initial Cost 10,938    
Improvements, Initial Cost 0    
Land, Total Cost 1,517    
Buildings & Improvements, Total Cost 4,583    
Total Cost 6,100    
Accumulated Depreciation 2,084    
Total Cost, Net of Accumulated Depreciation 4,016    
Encumbrances 5,264    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Dearborn Heights, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,463    
Buildings & Improvements, Initial Cost 2,946    
Improvements, Initial Cost 0    
Land, Total Cost 2,463    
Buildings & Improvements, Total Cost 2,946    
Total Cost 5,409    
Accumulated Depreciation 566    
Total Cost, Net of Accumulated Depreciation 4,843    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Livonia, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,396    
Buildings & Improvements, Initial Cost 2,680    
Improvements, Initial Cost 0    
Land, Total Cost 1,396    
Buildings & Improvements, Total Cost 2,680    
Total Cost 4,076    
Accumulated Depreciation 516    
Total Cost, Net of Accumulated Depreciation 3,560    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Westland, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,400    
Buildings & Improvements, Initial Cost 2,531    
Improvements, Initial Cost 0    
Land, Total Cost 1,400    
Buildings & Improvements, Total Cost 2,531    
Total Cost 3,931    
Accumulated Depreciation 491    
Total Cost, Net of Accumulated Depreciation 3,440    
Encumbrances 2,625    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Cary, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,264    
Buildings & Improvements, Initial Cost 4,581    
Improvements, Initial Cost 0    
Land, Total Cost 1,079    
Buildings & Improvements, Total Cost 3,742    
Total Cost 4,821    
Accumulated Depreciation 1,206    
Total Cost, Net of Accumulated Depreciation 3,615    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Winston-Salem, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,156    
Buildings & Improvements, Initial Cost 15,010    
Improvements, Initial Cost 0    
Land, Total Cost 7,156    
Buildings & Improvements, Total Cost 15,010    
Total Cost 22,166    
Accumulated Depreciation 2,956    
Total Cost, Net of Accumulated Depreciation 19,210    
Encumbrances 5,620    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Cheektowaga, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,740    
Buildings & Improvements, Initial Cost 2,417    
Improvements, Initial Cost 0    
Land, Total Cost 1,740    
Buildings & Improvements, Total Cost 2,417    
Total Cost 4,157    
Accumulated Depreciation 460    
Total Cost, Net of Accumulated Depreciation 3,697    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Dunkirk, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 1,487    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 1,487    
Total Cost 1,487    
Accumulated Depreciation 288    
Total Cost, Net of Accumulated Depreciation 1,199    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Alliance, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 812    
Buildings & Improvements, Initial Cost 16,244    
Improvements, Initial Cost 0    
Land, Total Cost 812    
Buildings & Improvements, Total Cost 16,244    
Total Cost 17,056    
Accumulated Depreciation 3,183    
Total Cost, Net of Accumulated Depreciation 13,873    
Encumbrances 7,002    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Cincinnati, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,805    
Buildings & Improvements, Initial Cost 5,028    
Improvements, Initial Cost 0    
Land, Total Cost 2,805    
Buildings & Improvements, Total Cost 5,028    
Total Cost 7,833    
Accumulated Depreciation 964    
Total Cost, Net of Accumulated Depreciation 6,869    
Encumbrances 2,537    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Cheswick, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 863    
Buildings & Improvements, Initial Cost 2,225    
Improvements, Initial Cost 0    
Land, Total Cost 863    
Buildings & Improvements, Total Cost 2,225    
Total Cost 3,088    
Accumulated Depreciation 424    
Total Cost, Net of Accumulated Depreciation 2,664    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 958    
Buildings & Improvements, Initial Cost 2,206    
Improvements, Initial Cost 0    
Land, Total Cost 958    
Buildings & Improvements, Total Cost 2,206    
Total Cost 3,164    
Accumulated Depreciation 409    
Total Cost, Net of Accumulated Depreciation 2,755    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,525    
Buildings & Improvements, Initial Cost 2,399    
Improvements, Initial Cost 0    
Land, Total Cost 378    
Buildings & Improvements, Total Cost 921    
Total Cost 1,299    
Accumulated Depreciation 433    
Total Cost, Net of Accumulated Depreciation 866    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 1,486    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 1,486    
Total Cost 1,486    
Accumulated Depreciation 286    
Total Cost, Net of Accumulated Depreciation 1,200    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,578    
Buildings & Improvements, Initial Cost 2,703    
Improvements, Initial Cost 0    
Land, Total Cost 1,578    
Buildings & Improvements, Total Cost 2,711    
Total Cost 4,289    
Accumulated Depreciation 501    
Total Cost, Net of Accumulated Depreciation 3,788    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,641    
Buildings & Improvements, Initial Cost 2,015    
Improvements, Initial Cost 0    
Land, Total Cost 1,641    
Buildings & Improvements, Total Cost 2,015    
Total Cost 3,656    
Accumulated Depreciation 384    
Total Cost, Net of Accumulated Depreciation 3,272    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Monroeville, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,431    
Buildings & Improvements, Initial Cost 2,006    
Improvements, Initial Cost 0    
Land, Total Cost 1,431    
Buildings & Improvements, Total Cost 2,014    
Total Cost 3,445    
Accumulated Depreciation 372    
Total Cost, Net of Accumulated Depreciation 3,073    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
New Castle, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,331    
Buildings & Improvements, Initial Cost 2,016    
Improvements, Initial Cost 0    
Land, Total Cost 1,331    
Buildings & Improvements, Total Cost 2,016    
Total Cost 3,347    
Accumulated Depreciation 385    
Total Cost, Net of Accumulated Depreciation 2,962    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Pittsburgh, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,771    
Buildings & Improvements, Initial Cost 2,523    
Improvements, Initial Cost 0    
Land, Total Cost 1,445    
Buildings & Improvements, Total Cost 2,148    
Total Cost 3,593    
Accumulated Depreciation 478    
Total Cost, Net of Accumulated Depreciation 3,115    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Greenville, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,452    
Buildings & Improvements, Initial Cost 1,891    
Improvements, Initial Cost 0    
Land, Total Cost 1,452    
Buildings & Improvements, Total Cost 1,956    
Total Cost 3,408    
Accumulated Depreciation 361    
Total Cost, Net of Accumulated Depreciation 3,047    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Greenville, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,659    
Buildings & Improvements, Initial Cost 14,411    
Improvements, Initial Cost 0    
Land, Total Cost 5,659    
Buildings & Improvements, Total Cost 14,411    
Total Cost 20,070    
Accumulated Depreciation 2,848    
Total Cost, Net of Accumulated Depreciation 17,222    
Encumbrances 5,464    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Woodruff, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,145    
Buildings & Improvements, Initial Cost 2,353    
Improvements, Initial Cost 0    
Land, Total Cost 1,145    
Buildings & Improvements, Total Cost 2,353    
Total Cost 3,498    
Accumulated Depreciation 454    
Total Cost, Net of Accumulated Depreciation 3,044    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Grand Prairie, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,892    
Buildings & Improvements, Initial Cost 3,226    
Improvements, Initial Cost 0    
Land, Total Cost 2,892    
Buildings & Improvements, Total Cost 3,226    
Total Cost 6,118    
Accumulated Depreciation 652    
Total Cost, Net of Accumulated Depreciation 5,466    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Houston, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,380    
Buildings & Improvements, Initial Cost 8,729    
Improvements, Initial Cost 0    
Land, Total Cost 4,380    
Buildings & Improvements, Total Cost 8,775    
Total Cost 13,155    
Accumulated Depreciation 1,747    
Total Cost, Net of Accumulated Depreciation 11,408    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Olympia, WA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,946    
Buildings & Improvements, Initial Cost 3,050    
Improvements, Initial Cost 0    
Land, Total Cost 2,946    
Buildings & Improvements, Total Cost 3,050    
Total Cost 5,996    
Accumulated Depreciation 565    
Total Cost, Net of Accumulated Depreciation 5,431    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Lakeland, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,800    
Buildings & Improvements, Initial Cost 3,148    
Improvements, Initial Cost 0    
Land, Total Cost 2,800    
Buildings & Improvements, Total Cost 3,682    
Total Cost 6,482    
Accumulated Depreciation 1,370    
Total Cost, Net of Accumulated Depreciation 5,112    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Evansville, IN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,964    
Buildings & Improvements, Initial Cost 18,764    
Improvements, Initial Cost 0    
Land, Total Cost 8,964    
Buildings & Improvements, Total Cost 18,797    
Total Cost 27,761    
Accumulated Depreciation 3,732    
Total Cost, Net of Accumulated Depreciation 24,029    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Apex, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,362    
Buildings & Improvements, Initial Cost 4,452    
Improvements, Initial Cost 0    
Land, Total Cost 2,362    
Buildings & Improvements, Total Cost 4,452    
Total Cost 6,814    
Accumulated Depreciation 499    
Total Cost, Net of Accumulated Depreciation 6,315    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Portfolio Balance (DDR) -unencumbered [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 205,696    
Buildings & Improvements, Initial Cost 194,608    
Improvements, Initial Cost 0    
Land, Total Cost 205,697    
Buildings & Improvements, Total Cost 194,609    
Total Cost 400,306    
Accumulated Depreciation 1,491    
Total Cost, Net of Accumulated Depreciation 398,815    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Portfolio Balance (DDR) -encumbered [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 62,753    
Buildings & Improvements, Initial Cost 180,721    
Improvements, Initial Cost 0    
Land, Total Cost 62,753    
Buildings & Improvements, Total Cost 180,721    
Total Cost 243,474    
Accumulated Depreciation 60,884    
Total Cost, Net of Accumulated Depreciation 182,590    
Encumbrances 46,277    
Depreciable Lives (Years) 31 years 6 months    
Bayamon, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 132,074    
Buildings & Improvements, Initial Cost 152,441    
Improvements, Initial Cost 0    
Land, Total Cost 132,759    
Buildings & Improvements, Total Cost 165,993    
Total Cost 298,752    
Accumulated Depreciation 39,712    
Total Cost, Net of Accumulated Depreciation 259,040    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Carolina, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 28,522    
Buildings & Improvements, Initial Cost 76,947    
Improvements, Initial Cost 0    
Land, Total Cost 28,601    
Buildings & Improvements, Total Cost 81,832    
Total Cost 110,433    
Accumulated Depreciation 20,262    
Total Cost, Net of Accumulated Depreciation 90,171    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Humacao, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 16,386    
Buildings & Improvements, Initial Cost 74,059    
Improvements, Initial Cost 0    
Land, Total Cost 16,386    
Buildings & Improvements, Total Cost 82,469    
Total Cost 98,855    
Accumulated Depreciation 21,768    
Total Cost, Net of Accumulated Depreciation 77,087    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Isabela, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,175    
Buildings & Improvements, Initial Cost 41,094    
Improvements, Initial Cost 0    
Land, Total Cost 8,236    
Buildings & Improvements, Total Cost 42,757    
Total Cost 50,993    
Accumulated Depreciation 10,891    
Total Cost, Net of Accumulated Depreciation 40,102    
Encumbrances 22,678    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
San German, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,215    
Buildings & Improvements, Initial Cost 24    
Improvements, Initial Cost 0    
Land, Total Cost 3,215    
Buildings & Improvements, Total Cost 41    
Total Cost 3,256    
Accumulated Depreciation 29    
Total Cost, Net of Accumulated Depreciation 3,227    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Cayey, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 18,226    
Buildings & Improvements, Initial Cost 25,101    
Improvements, Initial Cost 0    
Land, Total Cost 18,538    
Buildings & Improvements, Total Cost 26,122    
Total Cost 44,660    
Accumulated Depreciation 6,839    
Total Cost, Net of Accumulated Depreciation 37,821    
Encumbrances 21,472    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Bayamon, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 91,645    
Buildings & Improvements, Initial Cost 98,007    
Improvements, Initial Cost 0    
Land, Total Cost 92,027    
Buildings & Improvements, Total Cost 108,265    
Total Cost 200,292    
Accumulated Depreciation 26,696    
Total Cost, Net of Accumulated Depreciation 173,596    
Encumbrances 125,700    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Rio Piedras, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,338    
Buildings & Improvements, Initial Cost 23,285    
Improvements, Initial Cost 0    
Land, Total Cost 10,338    
Buildings & Improvements, Total Cost 29,754    
Total Cost 40,092    
Accumulated Depreciation 7,130    
Total Cost, Net of Accumulated Depreciation 32,962    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Bayamon, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,294    
Buildings & Improvements, Initial Cost 11,987    
Improvements, Initial Cost 0    
Land, Total Cost 4,584    
Buildings & Improvements, Total Cost 22,820    
Total Cost 27,404    
Accumulated Depreciation 3,727    
Total Cost, Net of Accumulated Depreciation 23,677    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Arecibo, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,965    
Buildings & Improvements, Initial Cost 29,898    
Improvements, Initial Cost 0    
Land, Total Cost 8,094    
Buildings & Improvements, Total Cost 32,351    
Total Cost 40,445    
Accumulated Depreciation 8,139    
Total Cost, Net of Accumulated Depreciation 32,306    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Hatillo, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 101,219    
Buildings & Improvements, Initial Cost 105,465    
Improvements, Initial Cost 0    
Land, Total Cost 101,219    
Buildings & Improvements, Total Cost 127,645    
Total Cost 228,864    
Accumulated Depreciation 30,493    
Total Cost, Net of Accumulated Depreciation 198,371    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Vega Baja, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,076    
Buildings & Improvements, Initial Cost 18,684    
Improvements, Initial Cost 0    
Land, Total Cost 7,076    
Buildings & Improvements, Total Cost 18,796    
Total Cost 25,872    
Accumulated Depreciation 4,866    
Total Cost, Net of Accumulated Depreciation 21,006    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Guayama, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,960    
Buildings & Improvements, Initial Cost 18,721    
Improvements, Initial Cost 0    
Land, Total Cost 1,960    
Buildings & Improvements, Total Cost 19,598    
Total Cost 21,558    
Accumulated Depreciation 4,944    
Total Cost, Net of Accumulated Depreciation 16,614    
Encumbrances 12,065    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Fajardo, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,376    
Buildings & Improvements, Initial Cost 41,199    
Improvements, Initial Cost 0    
Land, Total Cost 4,376    
Buildings & Improvements, Total Cost 41,730    
Total Cost 46,106    
Accumulated Depreciation 10,660    
Total Cost, Net of Accumulated Depreciation 35,446    
Encumbrances 25,816    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
San German, PR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,470    
Buildings & Improvements, Initial Cost 20,751    
Improvements, Initial Cost 0    
Land, Total Cost 6,470    
Buildings & Improvements, Total Cost 21,326    
Total Cost 27,796    
Accumulated Depreciation 5,530    
Total Cost, Net of Accumulated Depreciation 22,266    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(A)    
Brandon, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 4,111    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 6,350    
Total Cost 6,350    
Accumulated Depreciation 5,199    
Total Cost, Net of Accumulated Depreciation 1,151    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1972(C)    
Stow, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 993    
Buildings & Improvements, Initial Cost 9,028    
Improvements, Initial Cost 0    
Land, Total Cost 993    
Buildings & Improvements, Total Cost 36,248    
Total Cost 37,241    
Accumulated Depreciation 14,591    
Total Cost, Net of Accumulated Depreciation 22,650    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1969(C)    
Westlake, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 424    
Buildings & Improvements, Initial Cost 3,803    
Improvements, Initial Cost 201    
Land, Total Cost 424    
Buildings & Improvements, Total Cost 10,375    
Total Cost 10,799    
Accumulated Depreciation 6,532    
Total Cost, Net of Accumulated Depreciation 4,267    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1974(C)    
E. Norriton, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 70    
Buildings & Improvements, Initial Cost 4,698    
Improvements, Initial Cost 233    
Land, Total Cost 70    
Buildings & Improvements, Total Cost 8,841    
Total Cost 8,911    
Accumulated Depreciation 6,832    
Total Cost, Net of Accumulated Depreciation 2,079    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1975(C)    
Palm Harbor, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,137    
Buildings & Improvements, Initial Cost 4,089    
Improvements, Initial Cost 0    
Land, Total Cost 1,137    
Buildings & Improvements, Total Cost 4,678    
Total Cost 5,815    
Accumulated Depreciation 2,433    
Total Cost, Net of Accumulated Depreciation 3,382    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(A)    
Homestead, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 23,390    
Buildings & Improvements, Initial Cost 59,639    
Improvements, Initial Cost 0    
Land, Total Cost 23,390    
Buildings & Improvements, Total Cost 61,464    
Total Cost 84,854    
Accumulated Depreciation 5,721    
Total Cost, Net of Accumulated Depreciation 79,133    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2008(C)    
Tarpon Springs, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 146    
Buildings & Improvements, Initial Cost 7,382    
Improvements, Initial Cost 81    
Land, Total Cost 146    
Buildings & Improvements, Total Cost 9,226    
Total Cost 9,372    
Accumulated Depreciation 6,761    
Total Cost, Net of Accumulated Depreciation 2,611    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1974(C)    
McHenry, IL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,294    
Buildings & Improvements, Initial Cost 5,251    
Improvements, Initial Cost 0    
Land, Total Cost 13,771    
Buildings & Improvements, Total Cost 58,591    
Total Cost 72,362    
Accumulated Depreciation 8,816    
Total Cost, Net of Accumulated Depreciation 63,546    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2006(C)    
Miami, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,626    
Buildings & Improvements, Initial Cost 30,457    
Improvements, Initial Cost 0    
Land, Total Cost 26,743    
Buildings & Improvements, Total Cost 111,274    
Total Cost 138,017    
Accumulated Depreciation 17,554    
Total Cost, Net of Accumulated Depreciation 120,463    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2006(C)    
San Antonio, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,990    
Buildings & Improvements, Initial Cost 28,404    
Improvements, Initial Cost 0    
Land, Total Cost 3,990    
Buildings & Improvements, Total Cost 36,505    
Total Cost 40,495    
Accumulated Depreciation 5,626    
Total Cost, Net of Accumulated Depreciation 34,869    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(C)    
Starkville, MS [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 703    
Buildings & Improvements, Initial Cost 6,921    
Improvements, Initial Cost 0    
Land, Total Cost 703    
Buildings & Improvements, Total Cost 7,059    
Total Cost 7,762    
Accumulated Depreciation 3,598    
Total Cost, Net of Accumulated Depreciation 4,164    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Gulfport, MS [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 36,370    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 51,870    
Total Cost 51,870    
Accumulated Depreciation 17,326    
Total Cost, Net of Accumulated Depreciation 34,544    
Encumbrances 23,968    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Tupelo, MS [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,213    
Buildings & Improvements, Initial Cost 14,979    
Improvements, Initial Cost 0    
Land, Total Cost 2,213    
Buildings & Improvements, Total Cost 18,880    
Total Cost 21,093    
Accumulated Depreciation 9,892    
Total Cost, Net of Accumulated Depreciation 11,201    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Jacksonville, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,714    
Buildings & Improvements, Initial Cost 9,425    
Improvements, Initial Cost 0    
Land, Total Cost 2,714    
Buildings & Improvements, Total Cost 9,823    
Total Cost 12,537    
Accumulated Depreciation 5,816    
Total Cost, Net of Accumulated Depreciation 6,721    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(A)    
Long Beach, CA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 111,512    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 143,943    
Total Cost 143,943    
Accumulated Depreciation 40,238    
Total Cost, Net of Accumulated Depreciation 103,705    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2005(C)    
Brunswick, ME [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,796    
Buildings & Improvements, Initial Cost 15,459    
Improvements, Initial Cost 0    
Land, Total Cost 3,796    
Buildings & Improvements, Total Cost 20,461    
Total Cost 24,257    
Accumulated Depreciation 9,697    
Total Cost, Net of Accumulated Depreciation 14,560    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1973(C)    
Oceanside, CA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 10,643    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 14,377    
Total Cost 14,377    
Accumulated Depreciation 5,434    
Total Cost, Net of Accumulated Depreciation 8,943    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2000(C)    
Reno, NV [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 366    
Improvements, Initial Cost 0    
Land, Total Cost 1,132    
Buildings & Improvements, Total Cost 4,696    
Total Cost 5,828    
Accumulated Depreciation 1,219    
Total Cost, Net of Accumulated Depreciation 4,609    
Encumbrances 2,751    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2000(C)    
Everett, MA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,311    
Buildings & Improvements, Initial Cost 44,647    
Improvements, Initial Cost 0    
Land, Total Cost 9,462    
Buildings & Improvements, Total Cost 51,488    
Total Cost 60,950    
Accumulated Depreciation 18,478    
Total Cost, Net of Accumulated Depreciation 42,472    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2001(C)    
Pasadena, CA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 46,957    
Buildings & Improvements, Initial Cost 101,475    
Improvements, Initial Cost 2,053    
Land, Total Cost 46,957    
Buildings & Improvements, Total Cost 105,858    
Total Cost 152,815    
Accumulated Depreciation 26,893    
Total Cost, Net of Accumulated Depreciation 125,922    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Salisbury, MD [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,070    
Buildings & Improvements, Initial Cost 12,495    
Improvements, Initial Cost 277    
Land, Total Cost 2,071    
Buildings & Improvements, Total Cost 13,051    
Total Cost 15,122    
Accumulated Depreciation 4,912    
Total Cost, Net of Accumulated Depreciation 10,210    
Encumbrances 8,506    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1999(C)    
Duluth, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 475    
Buildings & Improvements, Initial Cost 9,374    
Improvements, Initial Cost 0    
Land, Total Cost 475    
Buildings & Improvements, Total Cost 10,117    
Total Cost 10,592    
Accumulated Depreciation 5,911    
Total Cost, Net of Accumulated Depreciation 4,681    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Apex, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,576    
Buildings & Improvements, Initial Cost 43,619    
Improvements, Initial Cost 0    
Land, Total Cost 10,521    
Buildings & Improvements, Total Cost 55,103    
Total Cost 65,624    
Accumulated Depreciation 10,429    
Total Cost, Net of Accumulated Depreciation 55,195    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2006(C)    
Erie, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,373    
Buildings & Improvements, Initial Cost 19,201    
Improvements, Initial Cost 0    
Land, Total Cost 6,373    
Buildings & Improvements, Total Cost 51,299    
Total Cost 57,672    
Accumulated Depreciation 23,490    
Total Cost, Net of Accumulated Depreciation 34,182    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(C)    
New Bern, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 441    
Buildings & Improvements, Initial Cost 6,575    
Improvements, Initial Cost 0    
Land, Total Cost 441    
Buildings & Improvements, Total Cost 6,593    
Total Cost 7,034    
Accumulated Depreciation 3,700    
Total Cost, Net of Accumulated Depreciation 3,334    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1989(C)    
Princeton, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 13,448    
Buildings & Improvements, Initial Cost 74,249    
Improvements, Initial Cost 0    
Land, Total Cost 14,464    
Buildings & Improvements, Total Cost 95,818    
Total Cost 110,282    
Accumulated Depreciation 36,798    
Total Cost, Net of Accumulated Depreciation 73,484    
Encumbrances 57,000    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Phoenix, AZ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 15,352    
Buildings & Improvements, Initial Cost 22,813    
Improvements, Initial Cost 1,601    
Land, Total Cost 15,352    
Buildings & Improvements, Total Cost 26,603    
Total Cost 41,955    
Accumulated Depreciation 11,980    
Total Cost, Net of Accumulated Depreciation 29,975    
Encumbrances 30,000    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2000(C)    
Russellville, AR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 606    
Buildings & Improvements, Initial Cost 13,391    
Improvements, Initial Cost 0    
Land, Total Cost 606    
Buildings & Improvements, Total Cost 18,069    
Total Cost 18,675    
Accumulated Depreciation 8,949    
Total Cost, Net of Accumulated Depreciation 9,726    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
N. Little Rock, AR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 907    
Buildings & Improvements, Initial Cost 17,160    
Improvements, Initial Cost 0    
Land, Total Cost 907    
Buildings & Improvements, Total Cost 21,301    
Total Cost 22,208    
Accumulated Depreciation 9,590    
Total Cost, Net of Accumulated Depreciation 12,618    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Washington, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 878    
Buildings & Improvements, Initial Cost 3,118    
Improvements, Initial Cost 34    
Land, Total Cost 878    
Buildings & Improvements, Total Cost 6,134    
Total Cost 7,012    
Accumulated Depreciation 3,109    
Total Cost, Net of Accumulated Depreciation 3,903    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1990(C)    
Littleton, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 12,249    
Buildings & Improvements, Initial Cost 50,709    
Improvements, Initial Cost 0    
Land, Total Cost 12,621    
Buildings & Improvements, Total Cost 55,651    
Total Cost 68,272    
Accumulated Depreciation 18,967    
Total Cost, Net of Accumulated Depreciation 49,305    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2002(C)    
Durham, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,210    
Buildings & Improvements, Initial Cost 11,671    
Improvements, Initial Cost 278    
Land, Total Cost 1,579    
Buildings & Improvements, Total Cost 13,081    
Total Cost 14,660    
Accumulated Depreciation 9,849    
Total Cost, Net of Accumulated Depreciation 4,811    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1990(C)    
San Antonio, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,475    
Buildings & Improvements, Initial Cost 37,327    
Improvements, Initial Cost 0    
Land, Total Cost 4,873    
Buildings & Improvements, Total Cost 47,338    
Total Cost 52,211    
Accumulated Depreciation 13,375    
Total Cost, Net of Accumulated Depreciation 38,836    
Encumbrances 24,800    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2002(A)    
Crystal River, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,217    
Buildings & Improvements, Initial Cost 5,796    
Improvements, Initial Cost 365    
Land, Total Cost 1,219    
Buildings & Improvements, Total Cost 10,245    
Total Cost 11,464    
Accumulated Depreciation 5,923    
Total Cost, Net of Accumulated Depreciation 5,541    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1986(C)    
Denver, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,987    
Buildings & Improvements, Initial Cost 11,950    
Improvements, Initial Cost 0    
Land, Total Cost 1,141    
Buildings & Improvements, Total Cost 4,387    
Total Cost 5,528    
Accumulated Depreciation 840    
Total Cost, Net of Accumulated Depreciation 4,688    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2001(A)    
Dublin, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,609    
Buildings & Improvements, Initial Cost 11,546    
Improvements, Initial Cost 0    
Land, Total Cost 3,609    
Buildings & Improvements, Total Cost 14,400    
Total Cost 18,009    
Accumulated Depreciation 5,896    
Total Cost, Net of Accumulated Depreciation 12,113    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Columbus, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,087    
Buildings & Improvements, Initial Cost 44,494    
Improvements, Initial Cost 0    
Land, Total Cost 12,243    
Buildings & Improvements, Total Cost 53,054    
Total Cost 65,297    
Accumulated Depreciation 23,559    
Total Cost, Net of Accumulated Depreciation 41,738    
Encumbrances 50,200    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Freehold, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,460    
Buildings & Improvements, Initial Cost 2,475    
Improvements, Initial Cost 0    
Land, Total Cost 3,166    
Buildings & Improvements, Total Cost 3,267    
Total Cost 6,433    
Accumulated Depreciation 417    
Total Cost, Net of Accumulated Depreciation 6,016    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Jackson, MS [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,190    
Buildings & Improvements, Initial Cost 6,783    
Improvements, Initial Cost 0    
Land, Total Cost 4,190    
Buildings & Improvements, Total Cost 7,474    
Total Cost 11,664    
Accumulated Depreciation 2,306    
Total Cost, Net of Accumulated Depreciation 9,358    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Scottsboro, AL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 788    
Buildings & Improvements, Initial Cost 2,781    
Improvements, Initial Cost 0    
Land, Total Cost 788    
Buildings & Improvements, Total Cost 3,233    
Total Cost 4,021    
Accumulated Depreciation 1,133    
Total Cost, Net of Accumulated Depreciation 2,888    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Ocala, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,916    
Buildings & Improvements, Initial Cost 3,893    
Improvements, Initial Cost 0    
Land, Total Cost 1,916    
Buildings & Improvements, Total Cost 6,018    
Total Cost 7,934    
Accumulated Depreciation 1,745    
Total Cost, Net of Accumulated Depreciation 6,189    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Tallahassee, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,881    
Buildings & Improvements, Initial Cost 2,956    
Improvements, Initial Cost 0    
Land, Total Cost 1,881    
Buildings & Improvements, Total Cost 7,299    
Total Cost 9,180    
Accumulated Depreciation 2,070    
Total Cost, Net of Accumulated Depreciation 7,110    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Cumming, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 14,249    
Buildings & Improvements, Initial Cost 23,653    
Improvements, Initial Cost 0    
Land, Total Cost 14,249    
Buildings & Improvements, Total Cost 24,954    
Total Cost 39,203    
Accumulated Depreciation 8,282    
Total Cost, Net of Accumulated Depreciation 30,921    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Douglasville, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,540    
Buildings & Improvements, Initial Cost 9,625    
Improvements, Initial Cost 0    
Land, Total Cost 3,540    
Buildings & Improvements, Total Cost 9,877    
Total Cost 13,417    
Accumulated Depreciation 3,246    
Total Cost, Net of Accumulated Depreciation 10,171    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Columbus, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,220    
Buildings & Improvements, Initial Cost 8,159    
Improvements, Initial Cost 0    
Land, Total Cost 4,220    
Buildings & Improvements, Total Cost 10,262    
Total Cost 14,482    
Accumulated Depreciation 3,167    
Total Cost, Net of Accumulated Depreciation 11,315    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Newnan, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,620    
Buildings & Improvements, Initial Cost 11,063    
Improvements, Initial Cost 0    
Land, Total Cost 2,620    
Buildings & Improvements, Total Cost 11,593    
Total Cost 14,213    
Accumulated Depreciation 3,751    
Total Cost, Net of Accumulated Depreciation 10,462    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Warner Robins, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,729    
Buildings & Improvements, Initial Cost 7,459    
Improvements, Initial Cost 0    
Land, Total Cost 5,729    
Buildings & Improvements, Total Cost 7,915    
Total Cost 13,644    
Accumulated Depreciation 2,655    
Total Cost, Net of Accumulated Depreciation 10,989    
Encumbrances 6,626    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Woodstock, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,486    
Buildings & Improvements, Initial Cost 2,573    
Improvements, Initial Cost 0    
Land, Total Cost 1,486    
Buildings & Improvements, Total Cost 2,630    
Total Cost 4,116    
Accumulated Depreciation 1,853    
Total Cost, Net of Accumulated Depreciation 2,263    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Fayetteville, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,524    
Buildings & Improvements, Initial Cost 10,627    
Improvements, Initial Cost 0    
Land, Total Cost 8,524    
Buildings & Improvements, Total Cost 14,715    
Total Cost 23,239    
Accumulated Depreciation 4,361    
Total Cost, Net of Accumulated Depreciation 18,878    
Encumbrances 9,681    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Charleston, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,479    
Buildings & Improvements, Initial Cost 9,850    
Improvements, Initial Cost 0    
Land, Total Cost 3,479    
Buildings & Improvements, Total Cost 16,743    
Total Cost 20,222    
Accumulated Depreciation 7,612    
Total Cost, Net of Accumulated Depreciation 12,610    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Denver, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 20,733    
Buildings & Improvements, Initial Cost 22,818    
Improvements, Initial Cost 0    
Land, Total Cost 20,804    
Buildings & Improvements, Total Cost 24,633    
Total Cost 45,437    
Accumulated Depreciation 8,159    
Total Cost, Net of Accumulated Depreciation 37,278    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Chattanooga, TN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,845    
Buildings & Improvements, Initial Cost 13,214    
Improvements, Initial Cost 0    
Land, Total Cost 1,845    
Buildings & Improvements, Total Cost 16,617    
Total Cost 18,462    
Accumulated Depreciation 5,803    
Total Cost, Net of Accumulated Depreciation 12,659    
Encumbrances 9,704    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Hendersonville, TN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,249    
Buildings & Improvements, Initial Cost 9,068    
Improvements, Initial Cost 0    
Land, Total Cost 3,249    
Buildings & Improvements, Total Cost 9,123    
Total Cost 12,372    
Accumulated Depreciation 2,965    
Total Cost, Net of Accumulated Depreciation 9,407    
Encumbrances 5,456    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Johnson City, TN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 521    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 2,013    
Total Cost 2,013    
Accumulated Depreciation 416    
Total Cost, Net of Accumulated Depreciation 1,597    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Chester, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,780    
Buildings & Improvements, Initial Cost 4,752    
Improvements, Initial Cost 0    
Land, Total Cost 10,780    
Buildings & Improvements, Total Cost 7,117    
Total Cost 17,897    
Accumulated Depreciation 2,753    
Total Cost, Net of Accumulated Depreciation 15,144    
Encumbrances 7,284    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Milwaukee, WI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,527    
Buildings & Improvements, Initial Cost 3,600    
Improvements, Initial Cost 0    
Land, Total Cost 4,527    
Buildings & Improvements, Total Cost 4,888    
Total Cost 9,415    
Accumulated Depreciation 1,528    
Total Cost, Net of Accumulated Depreciation 7,887    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Suwanee, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 13,479    
Buildings & Improvements, Initial Cost 23,923    
Improvements, Initial Cost 0    
Land, Total Cost 13,335    
Buildings & Improvements, Total Cost 30,528    
Total Cost 43,863    
Accumulated Depreciation 9,691    
Total Cost, Net of Accumulated Depreciation 34,172    
Encumbrances 25,322    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
West Allis, WI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,371    
Buildings & Improvements, Initial Cost 10,982    
Improvements, Initial Cost 0    
Land, Total Cost 2,371    
Buildings & Improvements, Total Cost 11,904    
Total Cost 14,275    
Accumulated Depreciation 3,727    
Total Cost, Net of Accumulated Depreciation 10,548    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Chesterfield, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 566    
Buildings & Improvements, Initial Cost 2,324    
Improvements, Initial Cost 0    
Land, Total Cost 48    
Buildings & Improvements, Total Cost 1,012    
Total Cost 1,060    
Accumulated Depreciation 569    
Total Cost, Net of Accumulated Depreciation 491    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2006(A)    
Orland Park, IL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,430    
Buildings & Improvements, Initial Cost 13,081    
Improvements, Initial Cost 0    
Land, Total Cost 10,430    
Buildings & Improvements, Total Cost 13,403    
Total Cost 23,833    
Accumulated Depreciation 3,679    
Total Cost, Net of Accumulated Depreciation 20,154    
Encumbrances 6,532    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Louisville, KY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,180    
Buildings & Improvements, Initial Cost 747    
Improvements, Initial Cost 0    
Land, Total Cost 4,288    
Buildings & Improvements, Total Cost 2,416    
Total Cost 6,704    
Accumulated Depreciation 587    
Total Cost, Net of Accumulated Depreciation 6,117    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
N. Charleston, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,146    
Buildings & Improvements, Initial Cost 5,990    
Improvements, Initial Cost 0    
Land, Total Cost 5,146    
Buildings & Improvements, Total Cost 10,167    
Total Cost 15,313    
Accumulated Depreciation 2,804    
Total Cost, Net of Accumulated Depreciation 12,509    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
West Long Branch, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 14,131    
Buildings & Improvements, Initial Cost 51,982    
Improvements, Initial Cost 0    
Land, Total Cost 14,131    
Buildings & Improvements, Total Cost 57,197    
Total Cost 71,328    
Accumulated Depreciation 15,062    
Total Cost, Net of Accumulated Depreciation 56,266    
Encumbrances 1,440    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Mays Landing, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 49,033    
Buildings & Improvements, Initial Cost 107,230    
Improvements, Initial Cost 0    
Land, Total Cost 49,033    
Buildings & Improvements, Total Cost 114,447    
Total Cost 163,480    
Accumulated Depreciation 32,169    
Total Cost, Net of Accumulated Depreciation 131,311    
Encumbrances 63,520    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Lakeland, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,778    
Buildings & Improvements, Initial Cost 2,302    
Improvements, Initial Cost 0    
Land, Total Cost 2,778    
Buildings & Improvements, Total Cost 2,457    
Total Cost 5,235    
Accumulated Depreciation 1,200    
Total Cost, Net of Accumulated Depreciation 4,035    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Toledo, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,316    
Buildings & Improvements, Initial Cost 3,961    
Improvements, Initial Cost 0    
Land, Total Cost 1,316    
Buildings & Improvements, Total Cost 3,961    
Total Cost 5,277    
Accumulated Depreciation 1,132    
Total Cost, Net of Accumulated Depreciation 4,145    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Mays Landing, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 36,224    
Buildings & Improvements, Initial Cost 56,949    
Improvements, Initial Cost 0    
Land, Total Cost 36,224    
Buildings & Improvements, Total Cost 61,649    
Total Cost 97,873    
Accumulated Depreciation 17,403    
Total Cost, Net of Accumulated Depreciation 80,470    
Encumbrances 5,061    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Indian Trail, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,999    
Buildings & Improvements, Initial Cost 7,075    
Improvements, Initial Cost 0    
Land, Total Cost 2,999    
Buildings & Improvements, Total Cost 7,623    
Total Cost 10,622    
Accumulated Depreciation 2,206    
Total Cost, Net of Accumulated Depreciation 8,416    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Ashtabula, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,444    
Buildings & Improvements, Initial Cost 9,912    
Improvements, Initial Cost 0    
Land, Total Cost 1,444    
Buildings & Improvements, Total Cost 10,058    
Total Cost 11,502    
Accumulated Depreciation 2,821    
Total Cost, Net of Accumulated Depreciation 8,681    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Horseheads, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 659    
Buildings & Improvements, Initial Cost 2,426    
Improvements, Initial Cost 0    
Land, Total Cost 4,777    
Buildings & Improvements, Total Cost 33,390    
Total Cost 38,167    
Accumulated Depreciation 3,660    
Total Cost, Net of Accumulated Depreciation 34,507    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
West Seneca, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,929    
Buildings & Improvements, Initial Cost 12,926    
Improvements, Initial Cost 0    
Land, Total Cost 2,929    
Buildings & Improvements, Total Cost 13,193    
Total Cost 16,122    
Accumulated Depreciation 3,664    
Total Cost, Net of Accumulated Depreciation 12,458    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
N. Tonawanda, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,806    
Buildings & Improvements, Initial Cost 21,291    
Improvements, Initial Cost 0    
Land, Total Cost 5,806    
Buildings & Improvements, Total Cost 22,648    
Total Cost 28,454    
Accumulated Depreciation 6,748    
Total Cost, Net of Accumulated Depreciation 21,706    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Amherst, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 28,331    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 25,205    
Total Cost 25,205    
Accumulated Depreciation 9,737    
Total Cost, Net of Accumulated Depreciation 15,468    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Ithaca, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,198    
Buildings & Improvements, Initial Cost 42,969    
Improvements, Initial Cost 0    
Land, Total Cost 9,198    
Buildings & Improvements, Total Cost 44,289    
Total Cost 53,487    
Accumulated Depreciation 12,064    
Total Cost, Net of Accumulated Depreciation 41,423    
Encumbrances 10,144    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Hamburg, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,303    
Buildings & Improvements, Initial Cost 16,239    
Improvements, Initial Cost 0    
Land, Total Cost 3,303    
Buildings & Improvements, Total Cost 16,546    
Total Cost 19,849    
Accumulated Depreciation 4,720    
Total Cost, Net of Accumulated Depreciation 15,129    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Hamburg, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,598    
Buildings & Improvements, Initial Cost 31,853    
Improvements, Initial Cost 0    
Land, Total Cost 6,598    
Buildings & Improvements, Total Cost 33,640    
Total Cost 40,238    
Accumulated Depreciation 9,435    
Total Cost, Net of Accumulated Depreciation 30,803    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Tonawanda, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,061    
Buildings & Improvements, Initial Cost 6,887    
Improvements, Initial Cost 0    
Land, Total Cost 3,061    
Buildings & Improvements, Total Cost 8,319    
Total Cost 11,380    
Accumulated Depreciation 2,391    
Total Cost, Net of Accumulated Depreciation 8,989    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Hamburg, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,152    
Buildings & Improvements, Initial Cost 22,075    
Improvements, Initial Cost 0    
Land, Total Cost 4,152    
Buildings & Improvements, Total Cost 22,738    
Total Cost 26,890    
Accumulated Depreciation 6,338    
Total Cost, Net of Accumulated Depreciation 20,552    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Olean, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,834    
Buildings & Improvements, Initial Cost 29,813    
Improvements, Initial Cost 0    
Land, Total Cost 8,844    
Buildings & Improvements, Total Cost 31,632    
Total Cost 40,476    
Accumulated Depreciation 9,133    
Total Cost, Net of Accumulated Depreciation 31,343    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Big Flats, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 22,229    
Buildings & Improvements, Initial Cost 52,579    
Improvements, Initial Cost 0    
Land, Total Cost 22,279    
Buildings & Improvements, Total Cost 57,956    
Total Cost 80,235    
Accumulated Depreciation 18,174    
Total Cost, Net of Accumulated Depreciation 62,061    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Williamsville, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,021    
Buildings & Improvements, Initial Cost 6,768    
Improvements, Initial Cost 0    
Land, Total Cost 5,021    
Buildings & Improvements, Total Cost 8,851    
Total Cost 13,872    
Accumulated Depreciation 2,940    
Total Cost, Net of Accumulated Depreciation 10,932    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Greece, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,901    
Buildings & Improvements, Initial Cost 4,922    
Improvements, Initial Cost 0    
Land, Total Cost 3,901    
Buildings & Improvements, Total Cost 4,923    
Total Cost 8,824    
Accumulated Depreciation 1,392    
Total Cost, Net of Accumulated Depreciation 7,432    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Buffalo, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,010    
Buildings & Improvements, Initial Cost 19,044    
Improvements, Initial Cost 0    
Land, Total Cost 6,010    
Buildings & Improvements, Total Cost 19,528    
Total Cost 25,538    
Accumulated Depreciation 5,346    
Total Cost, Net of Accumulated Depreciation 20,192    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Lockport, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,253    
Buildings & Improvements, Initial Cost 23,829    
Improvements, Initial Cost 0    
Land, Total Cost 9,253    
Buildings & Improvements, Total Cost 24,225    
Total Cost 33,478    
Accumulated Depreciation 6,781    
Total Cost, Net of Accumulated Depreciation 26,697    
Encumbrances 5,114    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Buffalo, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,568    
Buildings & Improvements, Initial Cost 29,001    
Improvements, Initial Cost 0    
Land, Total Cost 3,620    
Buildings & Improvements, Total Cost 29,658    
Total Cost 33,278    
Accumulated Depreciation 8,193    
Total Cost, Net of Accumulated Depreciation 25,085    
Encumbrances 9,963    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Cheektowaga, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 15,471    
Buildings & Improvements, Initial Cost 25,600    
Improvements, Initial Cost 0    
Land, Total Cost 15,471    
Buildings & Improvements, Total Cost 27,158    
Total Cost 42,629    
Accumulated Depreciation 8,264    
Total Cost, Net of Accumulated Depreciation 34,365    
Encumbrances 2,517    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
New Hartford, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,279    
Buildings & Improvements, Initial Cost 13,685    
Improvements, Initial Cost 0    
Land, Total Cost 1,279    
Buildings & Improvements, Total Cost 13,776    
Total Cost 15,055    
Accumulated Depreciation 3,872    
Total Cost, Net of Accumulated Depreciation 11,183    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Gates, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,369    
Buildings & Improvements, Initial Cost 40,672    
Improvements, Initial Cost 0    
Land, Total Cost 9,369    
Buildings & Improvements, Total Cost 42,075    
Total Cost 51,444    
Accumulated Depreciation 12,058    
Total Cost, Net of Accumulated Depreciation 39,386    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Rome, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,565    
Buildings & Improvements, Initial Cost 5,078    
Improvements, Initial Cost 0    
Land, Total Cost 4,565    
Buildings & Improvements, Total Cost 9,411    
Total Cost 13,976    
Accumulated Depreciation 2,424    
Total Cost, Net of Accumulated Depreciation 11,552    
Encumbrances 2,023    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Dewitt, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 881    
Buildings & Improvements, Initial Cost 5,686    
Improvements, Initial Cost 0    
Land, Total Cost 561    
Buildings & Improvements, Total Cost 4,196    
Total Cost 4,757    
Accumulated Depreciation 1,577    
Total Cost, Net of Accumulated Depreciation 3,180    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Niskayuna, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 20,297    
Buildings & Improvements, Initial Cost 51,155    
Improvements, Initial Cost 0    
Land, Total Cost 20,297    
Buildings & Improvements, Total Cost 52,586    
Total Cost 72,883    
Accumulated Depreciation 15,053    
Total Cost, Net of Accumulated Depreciation 57,830    
Encumbrances 13,878    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Victor, NY [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,374    
Buildings & Improvements, Initial Cost 6,433    
Improvements, Initial Cost 0    
Land, Total Cost 2,374    
Buildings & Improvements, Total Cost 7,007    
Total Cost 9,381    
Accumulated Depreciation 1,908    
Total Cost, Net of Accumulated Depreciation 7,473    
Encumbrances 5,802    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Allentown, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,558    
Buildings & Improvements, Initial Cost 20,060    
Improvements, Initial Cost 0    
Land, Total Cost 5,558    
Buildings & Improvements, Total Cost 23,098    
Total Cost 28,656    
Accumulated Depreciation 6,957    
Total Cost, Net of Accumulated Depreciation 21,699    
Encumbrances 12,250    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
St. John, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,613    
Buildings & Improvements, Initial Cost 7,040    
Improvements, Initial Cost 0    
Land, Total Cost 2,827    
Buildings & Improvements, Total Cost 8,122    
Total Cost 10,949    
Accumulated Depreciation 2,565    
Total Cost, Net of Accumulated Depreciation 8,384    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Ft. Collins, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,129    
Buildings & Improvements, Initial Cost 2,054    
Improvements, Initial Cost 0    
Land, Total Cost 1,129    
Buildings & Improvements, Total Cost 4,579    
Total Cost 5,708    
Accumulated Depreciation 1,376    
Total Cost, Net of Accumulated Depreciation 4,332    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Lakeland, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,445    
Improvements, Initial Cost 0    
Land, Total Cost 1,445    
Buildings & Improvements, Total Cost 5,863    
Total Cost 7,308    
Accumulated Depreciation 1,207    
Total Cost, Net of Accumulated Depreciation 6,101    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Hamilton, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,039    
Buildings & Improvements, Initial Cost 49,896    
Improvements, Initial Cost 0    
Land, Total Cost 11,774    
Buildings & Improvements, Total Cost 85,560    
Total Cost 97,334    
Accumulated Depreciation 23,049    
Total Cost, Net of Accumulated Depreciation 74,285    
Encumbrances 40,419    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Lansing, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,598    
Buildings & Improvements, Initial Cost 6,999    
Improvements, Initial Cost 0    
Land, Total Cost 1,801    
Buildings & Improvements, Total Cost 11,825    
Total Cost 13,626    
Accumulated Depreciation 3,405    
Total Cost, Net of Accumulated Depreciation 10,221    
Encumbrances 6,496    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
San Antonio, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,613    
Buildings & Improvements, Initial Cost 10,791    
Improvements, Initial Cost 0    
Land, Total Cost 6,168    
Buildings & Improvements, Total Cost 70,946    
Total Cost 77,114    
Accumulated Depreciation 9,264    
Total Cost, Net of Accumulated Depreciation 67,850    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(C)    
San Antonio, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,381    
Buildings & Improvements, Initial Cost 6,487    
Improvements, Initial Cost 0    
Land, Total Cost 2,381    
Buildings & Improvements, Total Cost 15,647    
Total Cost 18,028    
Accumulated Depreciation 4,257    
Total Cost, Net of Accumulated Depreciation 13,771    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Kyle, TX [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,548    
Buildings & Improvements, Initial Cost 7,349    
Improvements, Initial Cost 0    
Land, Total Cost 4,676    
Buildings & Improvements, Total Cost 17,014    
Total Cost 21,690    
Accumulated Depreciation 1,183    
Total Cost, Net of Accumulated Depreciation 20,507    
Encumbrances 21,470    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2009(C)    
Brandon, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,775    
Buildings & Improvements, Initial Cost 13,117    
Improvements, Initial Cost 0    
Land, Total Cost 4,775    
Buildings & Improvements, Total Cost 14,243    
Total Cost 19,018    
Accumulated Depreciation 1,366    
Total Cost, Net of Accumulated Depreciation 17,652    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2009(A)    
Atlanta, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 14,078    
Buildings & Improvements, Initial Cost 41,050    
Improvements, Initial Cost 0    
Land, Total Cost 14,078    
Buildings & Improvements, Total Cost 41,950    
Total Cost 56,028    
Accumulated Depreciation 4,020    
Total Cost, Net of Accumulated Depreciation 52,008    
Encumbrances 43,300    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2009(A)    
Marietta, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,745    
Buildings & Improvements, Initial Cost 27,737    
Improvements, Initial Cost 0    
Land, Total Cost 9,137    
Buildings & Improvements, Total Cost 28,710    
Total Cost 37,847    
Accumulated Depreciation 2,945    
Total Cost, Net of Accumulated Depreciation 34,902    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2009(A)    
Maple Grove, MN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,917    
Buildings & Improvements, Initial Cost 23,954    
Improvements, Initial Cost 0    
Land, Total Cost 8,917    
Buildings & Improvements, Total Cost 24,336    
Total Cost 33,253    
Accumulated Depreciation 1,426    
Total Cost, Net of Accumulated Depreciation 31,827    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Charlotte Two [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 27,707    
Buildings & Improvements, Initial Cost 45,021    
Improvements, Initial Cost 0    
Land, Total Cost 27,707    
Buildings & Improvements, Total Cost 45,364    
Total Cost 73,071    
Accumulated Depreciation 1,986    
Total Cost, Net of Accumulated Depreciation 71,085    
Encumbrances 50,045    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Charlotte Three [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,733    
Buildings & Improvements, Initial Cost 5,424    
Improvements, Initial Cost 0    
Land, Total Cost 4,733    
Buildings & Improvements, Total Cost 5,452    
Total Cost 10,185    
Accumulated Depreciation 229    
Total Cost, Net of Accumulated Depreciation 9,956    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Colorado Springs, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,075    
Buildings & Improvements, Initial Cost 20,248    
Improvements, Initial Cost 0    
Land, Total Cost 4,075    
Buildings & Improvements, Total Cost 20,663    
Total Cost 24,738    
Accumulated Depreciation 959    
Total Cost, Net of Accumulated Depreciation 23,779    
Encumbrances 9,196    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Columbus, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 18,716    
Buildings & Improvements, Initial Cost 64,617    
Improvements, Initial Cost 0    
Land, Total Cost 18,716    
Buildings & Improvements, Total Cost 64,784    
Total Cost 83,500    
Accumulated Depreciation 2,478    
Total Cost, Net of Accumulated Depreciation 81,022    
Encumbrances 44,758    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Portland, OR [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 20,208    
Buildings & Improvements, Initial Cost 50,738    
Improvements, Initial Cost 0    
Land, Total Cost 20,208    
Buildings & Improvements, Total Cost 50,904    
Total Cost 71,112    
Accumulated Depreciation 1,365    
Total Cost, Net of Accumulated Depreciation 69,747    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Phoenix, AZ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 15,090    
Buildings & Improvements, Initial Cost 36,880    
Improvements, Initial Cost 0    
Land, Total Cost 15,090    
Buildings & Improvements, Total Cost 37,903    
Total Cost 52,993    
Accumulated Depreciation 1,038    
Total Cost, Net of Accumulated Depreciation 51,955    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Tucson, AZ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 19,298    
Buildings & Improvements, Initial Cost 94,117    
Improvements, Initial Cost 0    
Land, Total Cost 19,298    
Buildings & Improvements, Total Cost 94,203    
Total Cost 113,501    
Accumulated Depreciation 1,486    
Total Cost, Net of Accumulated Depreciation 112,015    
Encumbrances 24,202    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Phoenix, AZ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 34,201    
Buildings & Improvements, Initial Cost 88,475    
Improvements, Initial Cost 0    
Land, Total Cost 34,201    
Buildings & Improvements, Total Cost 90,312    
Total Cost 124,513    
Accumulated Depreciation 1,339    
Total Cost, Net of Accumulated Depreciation 123,174    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Independence, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,011    
Buildings & Improvements, Initial Cost 45,752    
Improvements, Initial Cost 0    
Land, Total Cost 5,011    
Buildings & Improvements, Total Cost 45,757    
Total Cost 50,768    
Accumulated Depreciation 407    
Total Cost, Net of Accumulated Depreciation 50,361    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Arnold, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 892    
Buildings & Improvements, Initial Cost 5,283    
Improvements, Initial Cost 0    
Land, Total Cost 892    
Buildings & Improvements, Total Cost 5,285    
Total Cost 6,177    
Accumulated Depreciation 46    
Total Cost, Net of Accumulated Depreciation 6,131    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Charlotte, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,224    
Buildings & Improvements, Initial Cost 82,124    
Improvements, Initial Cost 0    
Land, Total Cost 11,224    
Buildings & Improvements, Total Cost 82,124    
Total Cost 93,348    
Total Cost, Net of Accumulated Depreciation 93,348    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Raleigh, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,317    
Buildings & Improvements, Initial Cost 35,411    
Improvements, Initial Cost 0    
Land, Total Cost 3,317    
Buildings & Improvements, Total Cost 35,411    
Total Cost 38,728    
Total Cost, Net of Accumulated Depreciation 38,728    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Tinley Park, IL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 9,120    
Buildings & Improvements, Initial Cost 37,496    
Improvements, Initial Cost 0    
Land, Total Cost 9,120    
Buildings & Improvements, Total Cost 37,525    
Total Cost 46,645    
Accumulated Depreciation 1,155    
Total Cost, Net of Accumulated Depreciation 45,490    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2012(A)    
Macon, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,940    
Buildings & Improvements, Initial Cost 5,192    
Improvements, Initial Cost 0    
Land, Total Cost 2,940    
Buildings & Improvements, Total Cost 5,477    
Total Cost 8,417    
Accumulated Depreciation 1,025    
Total Cost, Net of Accumulated Depreciation 7,392    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Snellville, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,185    
Buildings & Improvements, Initial Cost 51,815    
Improvements, Initial Cost 0    
Land, Total Cost 10,342    
Buildings & Improvements, Total Cost 54,205    
Total Cost 64,547    
Accumulated Depreciation 10,250    
Total Cost, Net of Accumulated Depreciation 54,297    
Encumbrances 21,200    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Union, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,650    
Buildings & Improvements, Initial Cost 15,689    
Improvements, Initial Cost 0    
Land, Total Cost 7,650    
Buildings & Improvements, Total Cost 22,823    
Total Cost 30,473    
Accumulated Depreciation 3,499    
Total Cost, Net of Accumulated Depreciation 26,974    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Boiling Springs, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,015    
Buildings & Improvements, Initial Cost 4,486    
Improvements, Initial Cost 0    
Land, Total Cost 1,015    
Buildings & Improvements, Total Cost 4,491    
Total Cost 5,506    
Accumulated Depreciation 1,262    
Total Cost, Net of Accumulated Depreciation 4,244    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Taylors, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,732    
Buildings & Improvements, Initial Cost 4,506    
Improvements, Initial Cost 0    
Land, Total Cost 1,732    
Buildings & Improvements, Total Cost 4,507    
Total Cost 6,239    
Accumulated Depreciation 863    
Total Cost, Net of Accumulated Depreciation 5,376    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Dothan, AL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,358    
Buildings & Improvements, Initial Cost 26,903    
Improvements, Initial Cost 0    
Land, Total Cost 3,358    
Buildings & Improvements, Total Cost 27,968    
Total Cost 31,326    
Accumulated Depreciation 5,261    
Total Cost, Net of Accumulated Depreciation 26,065    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Bradenton, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,766    
Buildings & Improvements, Initial Cost 31,203    
Improvements, Initial Cost 0    
Land, Total Cost 10,916    
Buildings & Improvements, Total Cost 35,024    
Total Cost 45,940    
Accumulated Depreciation 12,857    
Total Cost, Net of Accumulated Depreciation 33,083    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Clearwater, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,579    
Buildings & Improvements, Initial Cost 15,855    
Improvements, Initial Cost 0    
Land, Total Cost 5,579    
Buildings & Improvements, Total Cost 17,539    
Total Cost 23,118    
Accumulated Depreciation 3,296    
Total Cost, Net of Accumulated Depreciation 19,822    
Encumbrances 6,956    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Tampa, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,699    
Buildings & Improvements, Initial Cost 3,338    
Improvements, Initial Cost 0    
Land, Total Cost 1,699    
Buildings & Improvements, Total Cost 3,390    
Total Cost 5,089    
Accumulated Depreciation 634    
Total Cost, Net of Accumulated Depreciation 4,455    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Tequesta, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,108    
Buildings & Improvements, Initial Cost 7,400    
Improvements, Initial Cost 0    
Land, Total Cost 2,108    
Buildings & Improvements, Total Cost 8,524    
Total Cost 10,632    
Accumulated Depreciation 2,086    
Total Cost, Net of Accumulated Depreciation 8,546    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Kennesaw, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,175    
Buildings & Improvements, Initial Cost 9,028    
Improvements, Initial Cost 0    
Land, Total Cost 6,175    
Buildings & Improvements, Total Cost 9,522    
Total Cost 15,697    
Accumulated Depreciation 1,742    
Total Cost, Net of Accumulated Depreciation 13,955    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Roswell, GA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,566    
Buildings & Improvements, Initial Cost 15,005    
Improvements, Initial Cost 0    
Land, Total Cost 6,566    
Buildings & Improvements, Total Cost 15,736    
Total Cost 22,302    
Accumulated Depreciation 6,697    
Total Cost, Net of Accumulated Depreciation 15,605    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Hagerstown, MD [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,440    
Buildings & Improvements, Initial Cost 9,697    
Improvements, Initial Cost 0    
Land, Total Cost 2,440    
Buildings & Improvements, Total Cost 11,743    
Total Cost 14,183    
Accumulated Depreciation 2,240    
Total Cost, Net of Accumulated Depreciation 11,943    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Greensboro, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,012    
Buildings & Improvements, Initial Cost 11,162    
Improvements, Initial Cost 0    
Land, Total Cost 5,105    
Buildings & Improvements, Total Cost 11,527    
Total Cost 16,632    
Accumulated Depreciation 2,216    
Total Cost, Net of Accumulated Depreciation 14,416    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Greensboro, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,153    
Buildings & Improvements, Initial Cost 9,455    
Improvements, Initial Cost 0    
Land, Total Cost 3,153    
Buildings & Improvements, Total Cost 9,755    
Total Cost 12,908    
Accumulated Depreciation 1,878    
Total Cost, Net of Accumulated Depreciation 11,030    
Encumbrances 4,676    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
East Hanover, NJ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,847    
Buildings & Improvements, Initial Cost 23,798    
Improvements, Initial Cost 0    
Land, Total Cost 3,847    
Buildings & Improvements, Total Cost 24,376    
Total Cost 28,223    
Accumulated Depreciation 4,603    
Total Cost, Net of Accumulated Depreciation 23,620    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Camp Hill, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,631    
Buildings & Improvements, Initial Cost 8,402    
Improvements, Initial Cost 0    
Land, Total Cost 1,631    
Buildings & Improvements, Total Cost 8,406    
Total Cost 10,037    
Accumulated Depreciation 1,607    
Total Cost, Net of Accumulated Depreciation 8,430    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Middletown, RI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,804    
Buildings & Improvements, Initial Cost 16,805    
Improvements, Initial Cost 0    
Land, Total Cost 3,842    
Buildings & Improvements, Total Cost 16,931    
Total Cost 20,773    
Accumulated Depreciation 3,233    
Total Cost, Net of Accumulated Depreciation 17,540    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Lexington, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,795    
Buildings & Improvements, Initial Cost 9,933    
Improvements, Initial Cost 0    
Land, Total Cost 1,795    
Buildings & Improvements, Total Cost 9,977    
Total Cost 11,772    
Accumulated Depreciation 1,885    
Total Cost, Net of Accumulated Depreciation 9,887    
Encumbrances 4,206    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Newport News, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,064    
Buildings & Improvements, Initial Cost 21,272    
Improvements, Initial Cost 0    
Land, Total Cost 4,026    
Buildings & Improvements, Total Cost 11,063    
Total Cost 15,089    
Accumulated Depreciation 4,064    
Total Cost, Net of Accumulated Depreciation 11,025    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Richmond, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,879    
Buildings & Improvements, Initial Cost 34,736    
Improvements, Initial Cost 0    
Land, Total Cost 11,879    
Buildings & Improvements, Total Cost 35,614    
Total Cost 47,493    
Accumulated Depreciation 6,788    
Total Cost, Net of Accumulated Depreciation 40,705    
Encumbrances 12,218    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Springfield, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 12,627    
Buildings & Improvements, Initial Cost 30,572    
Improvements, Initial Cost 0    
Land, Total Cost 12,627    
Buildings & Improvements, Total Cost 31,546    
Total Cost 44,173    
Accumulated Depreciation 5,950    
Total Cost, Net of Accumulated Depreciation 38,223    
Encumbrances 10,809    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Springfield, VA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,389    
Buildings & Improvements, Initial Cost 9,466    
Improvements, Initial Cost 0    
Land, Total Cost 4,389    
Buildings & Improvements, Total Cost 10,167    
Total Cost 14,556    
Accumulated Depreciation 2,111    
Total Cost, Net of Accumulated Depreciation 12,445    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
San Francisco, CA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,464    
Buildings & Improvements, Initial Cost 25,730    
Improvements, Initial Cost 0    
Land, Total Cost 10,464    
Buildings & Improvements, Total Cost 26,135    
Total Cost 36,599    
Accumulated Depreciation 6,818    
Total Cost, Net of Accumulated Depreciation 29,781    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2002(A)    
Chillicothe, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 43    
Buildings & Improvements, Initial Cost 2,549    
Improvements, Initial Cost 2    
Land, Total Cost 1,170    
Buildings & Improvements, Total Cost 4,405    
Total Cost 5,575    
Accumulated Depreciation 2,392    
Total Cost, Net of Accumulated Depreciation 3,183    
Encumbrances 4,183    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1974(C)    
Phoenix, AZ [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 18,701    
Buildings & Improvements, Initial Cost 18,811    
Improvements, Initial Cost 118    
Land, Total Cost 18,701    
Buildings & Improvements, Total Cost 19,814    
Total Cost 38,515    
Accumulated Depreciation 4,239    
Total Cost, Net of Accumulated Depreciation 34,276    
Encumbrances 17,153    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1999(A)    
Macedonia, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 11,582    
Buildings & Improvements, Initial Cost 34,323    
Improvements, Initial Cost 0    
Land, Total Cost 11,582    
Buildings & Improvements, Total Cost 34,706    
Total Cost 46,288    
Accumulated Depreciation 4,986    
Total Cost, Net of Accumulated Depreciation 41,302    
Encumbrances 20,267    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2011(A)    
Huber Hts, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 757    
Buildings & Improvements, Initial Cost 14,469    
Improvements, Initial Cost 0    
Land, Total Cost 757    
Buildings & Improvements, Total Cost 25,291    
Total Cost 26,048    
Accumulated Depreciation 12,599    
Total Cost, Net of Accumulated Depreciation 13,449    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
Boardman, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 8,152    
Buildings & Improvements, Initial Cost 27,983    
Improvements, Initial Cost 0    
Land, Total Cost 8,152    
Buildings & Improvements, Total Cost 28,805    
Total Cost 36,957    
Accumulated Depreciation 13,818    
Total Cost, Net of Accumulated Depreciation 23,139    
Encumbrances 25,322    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1997(A)    
Solon, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 6,220    
Buildings & Improvements, Initial Cost 7,454    
Improvements, Initial Cost 0    
Land, Total Cost 6,220    
Buildings & Improvements, Total Cost 22,531    
Total Cost 28,751    
Accumulated Depreciation 9,429    
Total Cost, Net of Accumulated Depreciation 19,322    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(C)    
Bedford, IN [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 706    
Buildings & Improvements, Initial Cost 8,425    
Improvements, Initial Cost 6    
Land, Total Cost 1,067    
Buildings & Improvements, Total Cost 11,509    
Total Cost 12,576    
Accumulated Depreciation 6,136    
Total Cost, Net of Accumulated Depreciation 6,440    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
Sunset Hills, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 12,791    
Buildings & Improvements, Initial Cost 38,404    
Improvements, Initial Cost 0    
Land, Total Cost 13,403    
Buildings & Improvements, Total Cost 48,486    
Total Cost 61,889    
Accumulated Depreciation 22,361    
Total Cost, Net of Accumulated Depreciation 39,528    
Encumbrances 27,257    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Brentwood, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,018    
Buildings & Improvements, Initial Cost 32,053    
Improvements, Initial Cost 0    
Land, Total Cost 10,018    
Buildings & Improvements, Total Cost 33,135    
Total Cost 43,153    
Accumulated Depreciation 15,202    
Total Cost, Net of Accumulated Depreciation 27,951    
Encumbrances 32,139    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Cedar Rapids, IA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,219    
Buildings & Improvements, Initial Cost 12,697    
Improvements, Initial Cost 0    
Land, Total Cost 4,219    
Buildings & Improvements, Total Cost 14,067    
Total Cost 18,286    
Accumulated Depreciation 6,585    
Total Cost, Net of Accumulated Depreciation 11,701    
Encumbrances 6,490    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Des Peres, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,775    
Buildings & Improvements, Initial Cost 8,370    
Improvements, Initial Cost 0    
Land, Total Cost 2,775    
Buildings & Improvements, Total Cost 10,401    
Total Cost 13,176    
Accumulated Depreciation 5,205    
Total Cost, Net of Accumulated Depreciation 7,971    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Springfield, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 2,048    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 2,518    
Total Cost 2,518    
Accumulated Depreciation 1,084    
Total Cost, Net of Accumulated Depreciation 1,434    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
St. Louis, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,159    
Buildings & Improvements, Initial Cost 3,818    
Improvements, Initial Cost 0    
Land, Total Cost 6,051    
Buildings & Improvements, Total Cost 7,652    
Total Cost 13,703    
Accumulated Depreciation 2,259    
Total Cost, Net of Accumulated Depreciation 11,444    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(C)    
Aurora, OH [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 832    
Buildings & Improvements, Initial Cost 7,560    
Improvements, Initial Cost 0    
Land, Total Cost 1,592    
Buildings & Improvements, Total Cost 14,071    
Total Cost 15,663    
Accumulated Depreciation 6,319    
Total Cost, Net of Accumulated Depreciation 9,344    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(C)    
Nampa, ID [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,395    
Buildings & Improvements, Initial Cost 8,563    
Improvements, Initial Cost 0    
Land, Total Cost 9,609    
Buildings & Improvements, Total Cost 92,025    
Total Cost 101,634    
Accumulated Depreciation 8,807    
Total Cost, Net of Accumulated Depreciation 92,827    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2007(A)    
Fenton, MO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 414    
Buildings & Improvements, Initial Cost 4,244    
Improvements, Initial Cost 476    
Land, Total Cost 430    
Buildings & Improvements, Total Cost 7,253    
Total Cost 7,683    
Accumulated Depreciation 5,762    
Total Cost, Net of Accumulated Depreciation 1,921    
Encumbrances 0    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1983(A)    
Simpsonville, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 417    
Buildings & Improvements, Initial Cost 6,563    
Improvements, Initial Cost 0    
Land, Total Cost 417    
Buildings & Improvements, Total Cost 6,793    
Total Cost 7,210    
Accumulated Depreciation 4,099    
Total Cost, Net of Accumulated Depreciation 3,111    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Camden, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 627    
Buildings & Improvements, Initial Cost 7,519    
Improvements, Initial Cost 7    
Land, Total Cost 1,021    
Buildings & Improvements, Total Cost 11,686    
Total Cost 12,707    
Accumulated Depreciation 6,570    
Total Cost, Net of Accumulated Depreciation 6,137    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
N. Charleston, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 911    
Buildings & Improvements, Initial Cost 11,346    
Improvements, Initial Cost 1    
Land, Total Cost 1,081    
Buildings & Improvements, Total Cost 16,888    
Total Cost 17,969    
Accumulated Depreciation 10,297    
Total Cost, Net of Accumulated Depreciation 7,672    
Encumbrances 10,668    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
Mt. Pleasant, SC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 2,430    
Buildings & Improvements, Initial Cost 10,470    
Improvements, Initial Cost 0    
Land, Total Cost 2,430    
Buildings & Improvements, Total Cost 21,180    
Total Cost 23,610    
Accumulated Depreciation 9,532    
Total Cost, Net of Accumulated Depreciation 14,078    
Encumbrances 11,679    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(A)    
Sault St. Marie, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,826    
Buildings & Improvements, Initial Cost 13,710    
Improvements, Initial Cost 0    
Land, Total Cost 1,826    
Buildings & Improvements, Total Cost 18,259    
Total Cost 20,085    
Accumulated Depreciation 8,888    
Total Cost, Net of Accumulated Depreciation 11,197    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1994(A)    
Grand Rapids, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,380    
Buildings & Improvements, Initial Cost 17,323    
Improvements, Initial Cost 0    
Land, Total Cost 3,380    
Buildings & Improvements, Total Cost 24,539    
Total Cost 27,919    
Accumulated Depreciation 10,123    
Total Cost, Net of Accumulated Depreciation 17,796    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(A)    
Howell, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 332    
Buildings & Improvements, Initial Cost 11,938    
Improvements, Initial Cost 1    
Land, Total Cost 332    
Buildings & Improvements, Total Cost 15,827    
Total Cost 16,159    
Accumulated Depreciation 9,228    
Total Cost, Net of Accumulated Depreciation 6,931    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
Mt. Pleasant, MI [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 767    
Buildings & Improvements, Initial Cost 7,769    
Improvements, Initial Cost 20    
Land, Total Cost 1,142    
Buildings & Improvements, Total Cost 21,242    
Total Cost 22,384    
Accumulated Depreciation 8,795    
Total Cost, Net of Accumulated Depreciation 13,589    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1993(A)    
Meridian, ID [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 24,591    
Buildings & Improvements, Initial Cost 31,779    
Improvements, Initial Cost 0    
Land, Total Cost 24,841    
Buildings & Improvements, Total Cost 62,317    
Total Cost 87,158    
Accumulated Depreciation 19,376    
Total Cost, Net of Accumulated Depreciation 67,782    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2001(C)    
Midvale, UT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 25,662    
Buildings & Improvements, Initial Cost 56,759    
Improvements, Initial Cost 0    
Land, Total Cost 28,395    
Buildings & Improvements, Total Cost 88,405    
Total Cost 116,800    
Accumulated Depreciation 31,107    
Total Cost, Net of Accumulated Depreciation 85,693    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Taylorsville, UT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 24,327    
Buildings & Improvements, Initial Cost 53,686    
Improvements, Initial Cost 0    
Land, Total Cost 31,368    
Buildings & Improvements, Total Cost 77,421    
Total Cost 108,789    
Accumulated Depreciation 32,744    
Total Cost, Net of Accumulated Depreciation 76,045    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Orem, UT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 5,428    
Buildings & Improvements, Initial Cost 12,259    
Improvements, Initial Cost 0    
Land, Total Cost 5,428    
Buildings & Improvements, Total Cost 17,171    
Total Cost 22,599    
Accumulated Depreciation 6,280    
Total Cost, Net of Accumulated Depreciation 16,319    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Riverdale, UT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 24,755    
Buildings & Improvements, Initial Cost 45,635    
Improvements, Initial Cost 0    
Land, Total Cost 24,755    
Buildings & Improvements, Total Cost 57,573    
Total Cost 82,328    
Accumulated Depreciation 21,884    
Total Cost, Net of Accumulated Depreciation 60,444    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Ogden, UT [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 3,620    
Buildings & Improvements, Initial Cost 7,716    
Improvements, Initial Cost 0    
Land, Total Cost 8,305    
Buildings & Improvements, Total Cost 8,886    
Total Cost 17,191    
Accumulated Depreciation 4,120    
Total Cost, Net of Accumulated Depreciation 13,071    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1998(A)    
Birmingham, AL [member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 10,573    
Buildings & Improvements, Initial Cost 26,002    
Improvements, Initial Cost 0    
Land, Total Cost 11,434    
Buildings & Improvements, Total Cost 52,697    
Total Cost 64,131    
Accumulated Depreciation 24,441    
Total Cost, Net of Accumulated Depreciation 39,690    
Encumbrances 24,014    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1995(A)    
Valencia, CA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 0    
Buildings & Improvements, Initial Cost 15,784    
Improvements, Initial Cost 0    
Land, Total Cost 0    
Buildings & Improvements, Total Cost 17,950    
Total Cost 17,950    
Accumulated Depreciation 3,301    
Total Cost, Net of Accumulated Depreciation 14,649    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2006(A)    
Allentown, PA [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,408    
Buildings & Improvements, Initial Cost 4,707    
Improvements, Initial Cost 0    
Land, Total Cost 4,408    
Buildings & Improvements, Total Cost 4,707    
Total Cost 9,115    
Accumulated Depreciation 1,368    
Total Cost, Net of Accumulated Depreciation 7,747    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Mooresville, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 14,369    
Buildings & Improvements, Initial Cost 43,688    
Improvements, Initial Cost 0    
Land, Total Cost 14,369    
Buildings & Improvements, Total Cost 46,323    
Total Cost 60,692    
Accumulated Depreciation 12,231    
Total Cost, Net of Accumulated Depreciation 48,461    
Encumbrances 17,706    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2004(A)    
Wilmington, NC [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 4,287    
Buildings & Improvements, Initial Cost 16,852    
Improvements, Initial Cost 1,183    
Land, Total Cost 4,287    
Buildings & Improvements, Total Cost 34,684    
Total Cost 38,971    
Accumulated Depreciation 19,992    
Total Cost, Net of Accumulated Depreciation 18,979    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1989(C)    
Spring Hill, FL [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 1,084    
Buildings & Improvements, Initial Cost 4,816    
Improvements, Initial Cost 266    
Land, Total Cost 2,096    
Buildings & Improvements, Total Cost 11,672    
Total Cost 13,768    
Accumulated Depreciation 6,702    
Total Cost, Net of Accumulated Depreciation 7,066    
Encumbrances 3,355    
Depreciable Lives (Years) 30 years    
Date of Construction (C) Acquisition (A) 1988(C)    
Broomfield, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 13,707    
Buildings & Improvements, Initial Cost 31,809    
Improvements, Initial Cost 0    
Land, Total Cost 5,975    
Buildings & Improvements, Total Cost 26,556    
Total Cost 32,531    
Accumulated Depreciation 12,540    
Total Cost, Net of Accumulated Depreciation 19,991    
Encumbrances 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 2003(A)    
Centennial, CO [Member]
      
Real Estate and Accumulated Depreciation [Line Items]      
Land, Initial Cost 7,833    
Buildings & Improvements, Initial Cost 35,550    
Improvements, Initial Cost 0    
Land, Total Cost 8,082    
Buildings & Improvements, Total Cost 62,062    
Total Cost 70,144    
Accumulated Depreciation 25,524    
Total Cost, Net of Accumulated Depreciation 44,620    
Encumbrances $ 0    
Depreciable Lives (Years) 31 years 6 months    
Date of Construction (C) Acquisition (A) 1997(C)