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Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 1,849,496
Buildings & Improvements, Initial Cost	5,482,803
Improvements, Initial Cost	3,727
Land, Total Cost	1,779,480
Buildings & Improvements, Total Cost	6,468,523
Total Cost	8,248,003
Accumulated Depreciation	1,953,479
Total Cost, Net of Accumulated Depreciation	6,294,524
Encumbrances	640,553
The changes in Total Real Estate Assets for the three years ended December 31, 2017 are as follows:
Balance at beginning of year	9,244,058	$ 10,128,199	$ 10,335,785
Acquisitions	82,137	130,512	226,885
Developments, improvements and expansions	119,651	148,521	305,772
Adjustments of property carrying values	(345,282)	(109,912)	(279,021)
Disposals	(852,561)	(1,053,262)	(461,222)
Balance at end of year	8,248,003	9,244,058	10,128,199
The changes in Accumulated Depreciation and Amortization for the three years ended December 31, 2017 are as follows:
Balance at beginning of year	1,996,176	2,062,899	1,909,585
Depreciation for year	285,484	317,402	309,462
Disposals	(328,181)	(384,125)	(156,148)
Balance at end of year	1,953,479	$ 1,996,176	$ 2,062,899
Goodyear, AZ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	11,859
Buildings & Improvements, Initial Cost	42,882
Improvements, Initial Cost	0
Land, Total Cost	11,399
Buildings & Improvements, Total Cost	41,632
Total Cost	53,031
Accumulated Depreciation	3,008
Total Cost, Net of Accumulated Depreciation	50,023
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2016
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	22,424
Total Cost	41,125
Accumulated Depreciation	8,124
Total Cost, Net of Accumulated Depreciation	33,001
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1999
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	27,450
Total Cost	42,802
Accumulated Depreciation	15,848
Total Cost, Net of Accumulated Depreciation	26,954
Encumbrances	$ 29,584
Date of Construction (C) Acquisition (A)	2003
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	18,399
Buildings & Improvements, Total Cost	41,566
Total Cost	59,965
Accumulated Depreciation	8,960
Total Cost, Net of Accumulated Depreciation	51,005
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
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	108,485
Total Cost	142,686
Accumulated Depreciation	20,093
Total Cost, Net of Accumulated Depreciation	122,593
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
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	18,341
Buildings & Improvements, Total Cost	93,955
Total Cost	112,296
Accumulated Depreciation	18,328
Total Cost, Net of Accumulated Depreciation	93,968
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Buena Park, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,269
Buildings & Improvements, Initial Cost	21,427
Improvements, Initial Cost	0
Land, Total Cost	27,269
Buildings & Improvements, Total Cost	21,976
Total Cost	49,245
Accumulated Depreciation	2,134
Total Cost, Net of Accumulated Depreciation	47,111
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Fontana, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,861
Buildings & Improvements, Initial Cost	57,931
Improvements, Initial Cost	0
Land, Total Cost	23,861
Buildings & Improvements, Total Cost	61,780
Total Cost	85,641
Accumulated Depreciation	6,799
Total Cost, Net of Accumulated Depreciation	78,842
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Long Beach, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 0
Buildings & Improvements, Initial Cost	147,918
Improvements, Initial Cost	0
Land, Total Cost	0
Buildings & Improvements, Total Cost	194,873
Total Cost	194,873
Accumulated Depreciation	69,731
Total Cost, Net of Accumulated Depreciation	125,142
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
Oakland, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,361
Buildings & Improvements, Initial Cost	33,538
Improvements, Initial Cost	0
Land, Total Cost	4,361
Buildings & Improvements, Total Cost	33,538
Total Cost	37,899
Accumulated Depreciation	5,262
Total Cost, Net of Accumulated Depreciation	32,637
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Roseville, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,574
Buildings & Improvements, Initial Cost	67,031
Improvements, Initial Cost	0
Land, Total Cost	23,574
Buildings & Improvements, Total Cost	67,704
Total Cost	91,278
Accumulated Depreciation	8,243
Total Cost, Net of Accumulated Depreciation	83,035
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
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	26,054
Total Cost	36,518
Accumulated Depreciation	11,184
Total Cost, Net of Accumulated Depreciation	25,334
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2002
Vista, CA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,677
Buildings & Improvements, Initial Cost	47,145
Improvements, Initial Cost	0
Land, Total Cost	11,576
Buildings & Improvements, Total Cost	45,462
Total Cost	57,038
Accumulated Depreciation	5,394
Total Cost, Net of Accumulated Depreciation	51,644
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Aurora, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,816
Buildings & Improvements, Initial Cost	20,798
Improvements, Initial Cost	0
Land, Total Cost	4,259
Buildings & Improvements, Total Cost	20,029
Total Cost	24,288
Accumulated Depreciation	3,286
Total Cost, Net of Accumulated Depreciation	21,002
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	65,098
Total Cost	73,180
Accumulated Depreciation	37,817
Total Cost, Net of Accumulated Depreciation	35,363
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1997
Colorado Springs, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,001
Buildings & Improvements, Initial Cost	47,671
Improvements, Initial Cost	0
Land, Total Cost	9,001
Buildings & Improvements, Total Cost	55,405
Total Cost	64,406
Accumulated Depreciation	9,506
Total Cost, Net of Accumulated Depreciation	54,900
Encumbrances	$ 18,443
Date of Construction (C) Acquisition (A)	2011
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	29,280
Total Cost	50,084
Accumulated Depreciation	13,415
Total Cost, Net of Accumulated Depreciation	36,669
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Parker, CO [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,632
Buildings & Improvements, Initial Cost	38,256
Improvements, Initial Cost	0
Land, Total Cost	4,632
Buildings & Improvements, Total Cost	39,415
Total Cost	44,047
Accumulated Depreciation	5,482
Total Cost, Net of Accumulated Depreciation	38,565
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Guilford, CT [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,588
Buildings & Improvements, Initial Cost	41,892
Improvements, Initial Cost	0
Land, Total Cost	6,209
Buildings & Improvements, Total Cost	60,274
Total Cost	66,483
Accumulated Depreciation	3,826
Total Cost, Net of Accumulated Depreciation	62,657
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Plainville, CT [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 17,528
Buildings & Improvements, Initial Cost	59,777
Improvements, Initial Cost	0
Land, Total Cost	17,528
Buildings & Improvements, Total Cost	67,287
Total Cost	84,815
Accumulated Depreciation	10,612
Total Cost, Net of Accumulated Depreciation	74,203
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	12,424
Total Cost	18,514
Accumulated Depreciation	4,300
Total Cost, Net of Accumulated Depreciation	14,214
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	8,880
Buildings & Improvements, Total Cost	33,692
Total Cost	42,572
Accumulated Depreciation	10,477
Total Cost, Net of Accumulated Depreciation	32,095
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	7,419
Total Cost	7,419
Accumulated Depreciation	5,444
Total Cost, Net of Accumulated Depreciation	1,975
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1972
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	18,868
Total Cost	23,643
Accumulated Depreciation	4,894
Total Cost, Net of Accumulated Depreciation	18,749
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Brandon, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,938
Buildings & Improvements, Initial Cost	13,685
Improvements, Initial Cost	0
Land, Total Cost	2,938
Buildings & Improvements, Total Cost	13,891
Total Cost	16,829
Accumulated Depreciation	2,181
Total Cost, Net of Accumulated Depreciation	14,648
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	21,667
Buildings & Improvements, Total Cost	53,550
Total Cost	75,217
Accumulated Depreciation	15,911
Total Cost, Net of Accumulated Depreciation	59,306
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2008
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	34,943
Buildings & Improvements, Total Cost	121,280
Total Cost	156,223
Accumulated Depreciation	38,110
Total Cost, Net of Accumulated Depreciation	118,113
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2006
Naples, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 10,172
Buildings & Improvements, Initial Cost	39,342
Improvements, Initial Cost	0
Land, Total Cost	10,172
Buildings & Improvements, Total Cost	39,226
Total Cost	49,398
Accumulated Depreciation	5,556
Total Cost, Net of Accumulated Depreciation	43,842
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Orlando, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,169
Buildings & Improvements, Initial Cost	23,473
Improvements, Initial Cost	0
Land, Total Cost	9,169
Buildings & Improvements, Total Cost	23,606
Total Cost	32,775
Accumulated Depreciation	2,356
Total Cost, Net of Accumulated Depreciation	30,419
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Orlando, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,082
Buildings & Improvements, Initial Cost	44,360
Improvements, Initial Cost	0
Land, Total Cost	23,082
Buildings & Improvements, Total Cost	44,399
Total Cost	67,481
Accumulated Depreciation	3,242
Total Cost, Net of Accumulated Depreciation	64,239
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
Orlando, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,528
Buildings & Improvements, Initial Cost	56,684
Improvements, Initial Cost	0
Land, Total Cost	12,035
Buildings & Improvements, Total Cost	74,881
Total Cost	86,916
Accumulated Depreciation	3,395
Total Cost, Net of Accumulated Depreciation	83,521
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2016
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	5,122
Total Cost	6,259
Accumulated Depreciation	3,535
Total Cost, Net of Accumulated Depreciation	2,724
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Plant City, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,304
Buildings & Improvements, Initial Cost	24,875
Improvements, Initial Cost	0
Land, Total Cost	4,304
Buildings & Improvements, Total Cost	32,333
Total Cost	36,637
Accumulated Depreciation	5,283
Total Cost, Net of Accumulated Depreciation	31,354
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	96,616
Total Cost	118,728
Accumulated Depreciation	36,849
Total Cost, Net of Accumulated Depreciation	81,879
Encumbrances	$ 43,334
Date of Construction (C) Acquisition (A)	2007
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	12,511
Total Cost	14,607
Accumulated Depreciation	9,096
Total Cost, Net of Accumulated Depreciation	5,511
Encumbrances	$ 1,089
Date of Construction (C) Acquisition (A)	1988
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	1,311
Buildings & Improvements, Total Cost	8,500
Total Cost	9,811
Accumulated Depreciation	3,017
Total Cost, Net of Accumulated Depreciation	6,794
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Tampa, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,124
Buildings & Improvements, Initial Cost	20,082
Improvements, Initial Cost	0
Land, Total Cost	4,124
Buildings & Improvements, Total Cost	21,839
Total Cost	25,963
Accumulated Depreciation	3,917
Total Cost, Net of Accumulated Depreciation	22,046
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	10,090
Total Cost	10,236
Accumulated Depreciation	7,926
Total Cost, Net of Accumulated Depreciation	2,310
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1974
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	1,690
Buildings & Improvements, Total Cost	12,531
Total Cost	14,221
Accumulated Depreciation	4,444
Total Cost, Net of Accumulated Depreciation	9,777
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	2,466
Buildings & Improvements, Total Cost	16,451
Total Cost	18,917
Accumulated Depreciation	6,245
Total Cost, Net of Accumulated Depreciation	12,672
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Winter Garden, FL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 38,945
Buildings & Improvements, Initial Cost	130,382
Improvements, Initial Cost	0
Land, Total Cost	38,945
Buildings & Improvements, Total Cost	133,626
Total Cost	172,571
Accumulated Depreciation	21,479
Total Cost, Net of Accumulated Depreciation	151,092
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	47,205
Total Cost	61,283
Accumulated Depreciation	11,590
Total Cost, Net of Accumulated Depreciation	49,693
Encumbrances	$ 40,969
Date of Construction (C) Acquisition (A)	2009
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	25,886
Total Cost	40,135
Accumulated Depreciation	12,842
Total Cost, Net of Accumulated Depreciation	27,293
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Cumming, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,851
Buildings & Improvements, Initial Cost	49,659
Improvements, Initial Cost	0
Land, Total Cost	6,851
Buildings & Improvements, Total Cost	50,062
Total Cost	56,913
Accumulated Depreciation	8,533
Total Cost, Net of Accumulated Depreciation	48,380
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Douglasville, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,812
Buildings & Improvements, Initial Cost	24,645
Improvements, Initial Cost	0
Land, Total Cost	6,812
Buildings & Improvements, Total Cost	26,064
Total Cost	32,876
Accumulated Depreciation	4,207
Total Cost, Net of Accumulated Depreciation	28,669
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Marietta, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,425
Buildings & Improvements, Initial Cost	27,737
Improvements, Initial Cost	0
Land, Total Cost	8,380
Buildings & Improvements, Total Cost	29,449
Total Cost	37,829
Accumulated Depreciation	8,145
Total Cost, Net of Accumulated Depreciation	29,684
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Newnan, GA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,858
Buildings & Improvements, Initial Cost	15,248
Improvements, Initial Cost	0
Land, Total Cost	2,651
Buildings & Improvements, Total Cost	15,940
Total Cost	18,591
Accumulated Depreciation	6,291
Total Cost, Net of Accumulated Depreciation	12,300
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	7,894
Buildings & Improvements, Total Cost	25,304
Total Cost	33,198
Accumulated Depreciation	10,208
Total Cost, Net of Accumulated Depreciation	22,990
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	57,598
Total Cost	67,940
Accumulated Depreciation	20,600
Total Cost, Net of Accumulated Depreciation	47,340
Encumbrances	$ 19,990
Date of Construction (C) Acquisition (A)	2007
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	33,307
Total Cost	46,642
Accumulated Depreciation	15,703
Total Cost, Net of Accumulated Depreciation	30,939
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	67,594
Total Cost	92,435
Accumulated Depreciation	30,942
Total Cost, Net of Accumulated Depreciation	61,493
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2001
Chicago, IL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 22,642
Buildings & Improvements, Initial Cost	82,754
Improvements, Initial Cost	0
Land, Total Cost	22,642
Buildings & Improvements, Total Cost	83,057
Total Cost	105,699
Accumulated Depreciation	9,825
Total Cost, Net of Accumulated Depreciation	95,874
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Chicago, IL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 23,588
Buildings & Improvements, Initial Cost	45,632
Improvements, Initial Cost	0
Land, Total Cost	23,588
Buildings & Improvements, Total Cost	45,632
Total Cost	69,220
Accumulated Depreciation	1,683
Total Cost, Net of Accumulated Depreciation	67,537
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2017
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	7,704
Buildings & Improvements, Total Cost	43,676
Total Cost	51,380
Accumulated Depreciation	19,879
Total Cost, Net of Accumulated Depreciation	31,501
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2006
Schaumburg, IL [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 27,466
Buildings & Improvements, Initial Cost	84,679
Improvements, Initial Cost	0
Land, Total Cost	27,466
Buildings & Improvements, Total Cost	94,451
Total Cost	121,917
Accumulated Depreciation	13,591
Total Cost, Net of Accumulated Depreciation	108,326
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	50,925
Total Cost	60,045
Accumulated Depreciation	11,436
Total Cost, Net of Accumulated Depreciation	48,609
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
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	5,394
Buildings & Improvements, Total Cost	13,928
Total Cost	19,322
Accumulated Depreciation	6,482
Total Cost, Net of Accumulated Depreciation	12,840
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Merriam, KS [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,043
Buildings & Improvements, Initial Cost	55,028
Improvements, Initial Cost	0
Land, Total Cost	15,043
Buildings & Improvements, Total Cost	55,996
Total Cost	71,039
Accumulated Depreciation	7,829
Total Cost, Net of Accumulated Depreciation	63,210
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	738
Buildings & Improvements, Total Cost	6,092
Total Cost	6,830
Accumulated Depreciation	4,811
Total Cost, Net of Accumulated Depreciation	2,019
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	15,300
Total Cost	17,371
Accumulated Depreciation	8,105
Total Cost, Net of Accumulated Depreciation	9,266
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1999
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	56,628
Total Cost	66,090
Accumulated Depreciation	27,677
Total Cost, Net of Accumulated Depreciation	38,413
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2001
Framingham, MA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 75,675
Buildings & Improvements, Initial Cost	191,594
Improvements, Initial Cost	0
Land, Total Cost	75,675
Buildings & Improvements, Total Cost	205,194
Total Cost	280,869
Accumulated Depreciation	29,915
Total Cost, Net of Accumulated Depreciation	250,954
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	26,979
Total Cost	30,359
Accumulated Depreciation	15,982
Total Cost, Net of Accumulated Depreciation	14,377
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Grandville, MI [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,483
Buildings & Improvements, Initial Cost	18,933
Improvements, Initial Cost	0
Land, Total Cost	5,069
Buildings & Improvements, Total Cost	16,556
Total Cost	21,625
Accumulated Depreciation	3,300
Total Cost, Net of Accumulated Depreciation	18,325
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Coon Rapids, MN [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 25,692
Buildings & Improvements, Initial Cost	106,300
Improvements, Initial Cost	0
Land, Total Cost	25,314
Buildings & Improvements, Total Cost	116,187
Total Cost	141,501
Accumulated Depreciation	16,561
Total Cost, Net of Accumulated Depreciation	124,940
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	27,319
Total Cost	36,236
Accumulated Depreciation	5,998
Total Cost, Net of Accumulated Depreciation	30,238
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2011
St. Paul, MN [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 7,150
Buildings & Improvements, Initial Cost	21,558
Improvements, Initial Cost	0
Land, Total Cost	7,150
Buildings & Improvements, Total Cost	23,120
Total Cost	30,270
Accumulated Depreciation	5,425
Total Cost, Net of Accumulated Depreciation	24,845
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	57,829
Total Cost	57,829
Accumulated Depreciation	26,436
Total Cost, Net of Accumulated Depreciation	31,393
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	19,555
Total Cost	21,768
Accumulated Depreciation	13,375
Total Cost, Net of Accumulated Depreciation	8,393
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1994
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	36,862
Total Cost	46,880
Accumulated Depreciation	20,149
Total Cost, Net of Accumulated Depreciation	26,731
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1998
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	48,382
Total Cost	53,393
Accumulated Depreciation	8,963
Total Cost, Net of Accumulated Depreciation	44,430
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Seabrook, NH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 18,032
Buildings & Improvements, Initial Cost	68,663
Improvements, Initial Cost	0
Land, Total Cost	8,526
Buildings & Improvements, Total Cost	36,678
Total Cost	45,204
Accumulated Depreciation	6,876
Total Cost, Net of Accumulated Depreciation	38,328
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
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	25,561
Total Cost	29,408
Accumulated Depreciation	8,724
Total Cost, Net of Accumulated Depreciation	20,684
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	31,288
Total Cost	39,002
Accumulated Depreciation	10,819
Total Cost, Net of Accumulated Depreciation	28,183
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	3,675
Total Cost	6,841
Accumulated Depreciation	1,008
Total Cost, Net of Accumulated Depreciation	5,833
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	86,615
Total Cost	98,389
Accumulated Depreciation	37,712
Total Cost, Net of Accumulated Depreciation	60,677
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
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	45,353
Buildings & Improvements, Total Cost	113,920
Total Cost	159,273
Accumulated Depreciation	52,022
Total Cost, Net of Accumulated Depreciation	107,251
Encumbrances	$ 56,009
Date of Construction (C) Acquisition (A)	2004
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	34,535
Buildings & Improvements, Total Cost	61,069
Total Cost	95,604
Accumulated Depreciation	27,571
Total Cost, Net of Accumulated Depreciation	68,033
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2004
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	14,455
Buildings & Improvements, Total Cost	99,199
Total Cost	113,654
Accumulated Depreciation	55,380
Total Cost, Net of Accumulated Depreciation	58,274
Encumbrances	$ 53,747
Date of Construction (C) Acquisition (A)	1997
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	25,015
Total Cost	32,665
Accumulated Depreciation	8,753
Total Cost, Net of Accumulated Depreciation	23,912
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	71,858
Total Cost	85,989
Accumulated Depreciation	26,166
Total Cost, Net of Accumulated Depreciation	59,823
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2004
Horseheads, NY [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 829
Buildings & Improvements, Initial Cost	3,630
Improvements, Initial Cost	0
Land, Total Cost	4,008
Buildings & Improvements, Total Cost	24,829
Total Cost	28,837
Accumulated Depreciation	9,063
Total Cost, Net of Accumulated Depreciation	19,774
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2008
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	56,320
Total Cost	66,841
Accumulated Depreciation	20,183
Total Cost, Net of Accumulated Depreciation	46,658
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2006
Charlotte, NC [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	50,682
Total Cost	78,389
Accumulated Depreciation	11,751
Total Cost, Net of Accumulated Depreciation	66,638
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2011
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	92,061
Total Cost	103,285
Accumulated Depreciation	17,761
Total Cost, Net of Accumulated Depreciation	85,524
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Charlotte, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 3,600
Buildings & Improvements, Initial Cost	30,392
Improvements, Initial Cost	0
Land, Total Cost	6,274
Buildings & Improvements, Total Cost	46,680
Total Cost	52,954
Accumulated Depreciation	5,724
Total Cost, Net of Accumulated Depreciation	47,230
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	21,000
Total Cost	25,382
Accumulated Depreciation	8,477
Total Cost, Net of Accumulated Depreciation	16,905
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	38,472
Total Cost	41,789
Accumulated Depreciation	7,108
Total Cost, Net of Accumulated Depreciation	34,681
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Wilmington, NC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 5,529
Buildings & Improvements, Initial Cost	18,551
Improvements, Initial Cost	1,183
Land, Total Cost	5,529
Buildings & Improvements, Total Cost	37,834
Total Cost	43,363
Accumulated Depreciation	26,948
Total Cost, Net of Accumulated Depreciation	16,415
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1989
Cincinnati, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 19,572
Buildings & Improvements, Initial Cost	54,495
Improvements, Initial Cost	0
Land, Total Cost	19,572
Buildings & Improvements, Total Cost	71,393
Total Cost	90,965
Accumulated Depreciation	6,567
Total Cost, Net of Accumulated Depreciation	84,398
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Columbus, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,922
Buildings & Improvements, Initial Cost	46,006
Improvements, Initial Cost	0
Land, Total Cost	14,078
Buildings & Improvements, Total Cost	62,256
Total Cost	76,334
Accumulated Depreciation	36,231
Total Cost, Net of Accumulated Depreciation	40,103
Encumbrances	$ 47,498
Date of Construction (C) Acquisition (A)	1998
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	20,666
Buildings & Improvements, Total Cost	70,978
Total Cost	91,644
Accumulated Depreciation	14,494
Total Cost, Net of Accumulated Depreciation	77,150
Encumbrances	$ 41,641
Date of Construction (C) Acquisition (A)	2011
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	15,105
Total Cost	18,714
Accumulated Depreciation	8,987
Total Cost, Net of Accumulated Depreciation	9,727
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1998
Mason, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,032
Buildings & Improvements, Initial Cost	23,788
Improvements, Initial Cost	0
Land, Total Cost	2,032
Buildings & Improvements, Total Cost	24,801
Total Cost	26,833
Accumulated Depreciation	3,108
Total Cost, Net of Accumulated Depreciation	23,725
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
North Olmsted, OH [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 24,352
Buildings & Improvements, Initial Cost	61,449
Improvements, Initial Cost	0
Land, Total Cost	24,352
Buildings & Improvements, Total Cost	64,246
Total Cost	88,598
Accumulated Depreciation	14,541
Total Cost, Net of Accumulated Depreciation	74,057
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	27,300
Total Cost	33,520
Accumulated Depreciation	15,127
Total Cost, Net of Accumulated Depreciation	18,393
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1998
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	38,070
Total Cost	39,063
Accumulated Depreciation	20,770
Total Cost, Net of Accumulated Depreciation	18,293
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1969
Stow, 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	534
Buildings & Improvements, Total Cost	2,366
Total Cost	2,900
Accumulated Depreciation	1,469
Total Cost, Net of Accumulated Depreciation	1,431
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2004
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	5,516
Total Cost	5,940
Accumulated Depreciation	3,232
Total Cost, Net of Accumulated Depreciation	2,708
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1974
Gresham, OR [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,234
Buildings & Improvements, Initial Cost	60,802
Improvements, Initial Cost	0
Land, Total Cost	11,770
Buildings & Improvements, Total Cost	48,771
Total Cost	60,541
Accumulated Depreciation	2,793
Total Cost, Net of Accumulated Depreciation	57,748
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2016
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	58,601
Total Cost	78,809
Accumulated Depreciation	10,346
Total Cost, Net of Accumulated Depreciation	68,463
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2012
Erie, PA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 9,345
Buildings & Improvements, Initial Cost	32,006
Improvements, Initial Cost	0
Land, Total Cost	9,345
Buildings & Improvements, Total Cost	73,700
Total Cost	83,045
Accumulated Depreciation	36,070
Total Cost, Net of Accumulated Depreciation	46,975
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Jenkintown, PA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,705
Buildings & Improvements, Initial Cost	21,918
Improvements, Initial Cost	0
Land, Total Cost	4,705
Buildings & Improvements, Total Cost	25,045
Total Cost	29,750
Accumulated Depreciation	3,324
Total Cost, Net of Accumulated Depreciation	26,426
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Mechanicsburg, PA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,574
Buildings & Improvements, Initial Cost	57,283
Improvements, Initial Cost	0
Land, Total Cost	12,574
Buildings & Improvements, Total Cost	57,791
Total Cost	70,365
Accumulated Depreciation	6,698
Total Cost, Net of Accumulated Depreciation	63,667
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
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	2,772
Buildings & Improvements, Total Cost	13,526
Total Cost	16,298
Accumulated Depreciation	9,719
Total Cost, Net of Accumulated Depreciation	6,579
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	110,904
Buildings & Improvements, Total Cost	175,842
Total Cost	286,746
Accumulated Depreciation	71,728
Total Cost, Net of Accumulated Depreciation	215,018
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	68,418
Buildings & Improvements, Total Cost	99,716
Total Cost	168,134
Accumulated Depreciation	44,749
Total Cost, Net of Accumulated Depreciation	123,385
Encumbrances	$ 118,933
Date of Construction (C) Acquisition (A)	2005
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	72,362
Total Cost	100,963
Accumulated Depreciation	30,463
Total Cost, Net of Accumulated Depreciation	70,500
Encumbrances	$ 68,262
Date of Construction (C) Acquisition (A)	2005
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	26,021
Total Cost	44,559
Accumulated Depreciation	10,485
Total Cost, Net of Accumulated Depreciation	34,074
Encumbrances	$ 19,933
Date of Construction (C) Acquisition (A)	2005
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	43,700
Total Cost	48,076
Accumulated Depreciation	15,910
Total Cost, Net of Accumulated Depreciation	32,166
Encumbrances	$ 23,969
Date of Construction (C) Acquisition (A)	2005
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	1,298
Buildings & Improvements, Total Cost	13,618
Total Cost	14,916
Accumulated Depreciation	7,024
Total Cost, Net of Accumulated Depreciation	7,892
Encumbrances	$ 11,205
Date of Construction (C) Acquisition (A)	2005
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	60,804
Buildings & Improvements, Total Cost	95,911
Total Cost	156,715
Accumulated Depreciation	52,102
Total Cost, Net of Accumulated Depreciation	104,613
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	37,139
Total Cost	53,525
Accumulated Depreciation	17,437
Total Cost, Net of Accumulated Depreciation	36,088
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	40,576
Total Cost	48,812
Accumulated Depreciation	16,944
Total Cost, Net of Accumulated Depreciation	31,868
Encumbrances	$ 21,054
Date of Construction (C) Acquisition (A)	2005
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	7,549
Buildings & Improvements, Total Cost	20,445
Total Cost	27,994
Accumulated Depreciation	10,346
Total Cost, Net of Accumulated Depreciation	17,648
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	3,851
Buildings & Improvements, Total Cost	9,278
Total Cost	13,129
Accumulated Depreciation	5,711
Total Cost, Net of Accumulated Depreciation	7,418
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2005
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	20,302
Total Cost	23,781
Accumulated Depreciation	11,537
Total Cost, Net of Accumulated Depreciation	12,244
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Columbia, SC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 2,950
Buildings & Improvements, Initial Cost	29,065
Improvements, Initial Cost	0
Land, Total Cost	2,950
Buildings & Improvements, Total Cost	39,934
Total Cost	42,884
Accumulated Depreciation	6,408
Total Cost, Net of Accumulated Depreciation	36,476
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Mount 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	2,341
Buildings & Improvements, Total Cost	23,011
Total Cost	25,352
Accumulated Depreciation	13,976
Total Cost, Net of Accumulated Depreciation	11,376
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	1995
Brentwood, TN [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 6,101
Buildings & Improvements, Initial Cost	25,956
Improvements, Initial Cost	0
Land, Total Cost	6,101
Buildings & Improvements, Total Cost	27,636
Total Cost	33,737
Accumulated Depreciation	4,090
Total Cost, Net of Accumulated Depreciation	29,647
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	4,433
Total Cost, Net of Accumulated Depreciation	7,939
Encumbrances	$ 1,508
Date of Construction (C) Acquisition (A)	2003
Highland Village, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 5,545
Buildings & Improvements, Initial Cost	28,365
Improvements, Initial Cost	0
Land, Total Cost	5,545
Buildings & Improvements, Total Cost	30,382
Total Cost	35,927
Accumulated Depreciation	5,493
Total Cost, Net of Accumulated Depreciation	30,434
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Houston, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,179
Buildings & Improvements, Initial Cost	60,407
Improvements, Initial Cost	0
Land, Total Cost	12,281
Buildings & Improvements, Total Cost	50,923
Total Cost	63,204
Accumulated Depreciation	5,880
Total Cost, Net of Accumulated Depreciation	57,324
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2015
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	10,426
Buildings & Improvements, Total Cost	22,654
Total Cost	33,080
Accumulated Depreciation	5,151
Total Cost, Net of Accumulated Depreciation	27,929
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2009
Mesquite, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 7,051
Buildings & Improvements, Initial Cost	25,531
Improvements, Initial Cost	0
Land, Total Cost	6,612
Buildings & Improvements, Total Cost	24,197
Total Cost	30,809
Accumulated Depreciation	3,990
Total Cost, Net of Accumulated Depreciation	26,819
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	51,295
Total Cost	56,168
Accumulated Depreciation	22,598
Total Cost, Net of Accumulated Depreciation	33,570
Encumbrances	$ 23,385
Date of Construction (C) Acquisition (A)	2002
San Antonio, TX [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 5,602
Buildings & Improvements, Initial Cost	39,196
Improvements, Initial Cost	0
Land, Total Cost	10,158
Buildings & Improvements, Total Cost	114,233
Total Cost	124,391
Accumulated Depreciation	34,403
Total Cost, Net of Accumulated Depreciation	89,988
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
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	23,172
Total Cost	25,553
Accumulated Depreciation	8,773
Total Cost, Net of Accumulated Depreciation	16,780
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Dumfries, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 12,911
Buildings & Improvements, Initial Cost	10,092
Improvements, Initial Cost	0
Land, Total Cost	11,566
Buildings & Improvements, Total Cost	9,236
Total Cost	20,802
Accumulated Depreciation	1,066
Total Cost, Net of Accumulated Depreciation	19,736
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Fairfax, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 15,681
Buildings & Improvements, Initial Cost	68,536
Improvements, Initial Cost	0
Land, Total Cost	15,681
Buildings & Improvements, Total Cost	69,525
Total Cost	85,206
Accumulated Depreciation	9,802
Total Cost, Net of Accumulated Depreciation	75,404
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Midlothian, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,754
Buildings & Improvements, Initial Cost	20,273
Improvements, Initial Cost	0
Land, Total Cost	4,754
Buildings & Improvements, Total Cost	25,777
Total Cost	30,531
Accumulated Depreciation	4,723
Total Cost, Net of Accumulated Depreciation	25,808
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	36,174
Total Cost	48,053
Accumulated Depreciation	12,844
Total Cost, Net of Accumulated Depreciation	35,209
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Springfield, VA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 17,016
Buildings & Improvements, Initial Cost	40,038
Improvements, Initial Cost	0
Land, Total Cost	17,016
Buildings & Improvements, Total Cost	41,183
Total Cost	58,199
Accumulated Depreciation	14,561
Total Cost, Net of Accumulated Depreciation	43,638
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2007
Vancouver, WA [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,169
Buildings & Improvements, Initial Cost	25,769
Improvements, Initial Cost	0
Land, Total Cost	3,239
Buildings & Improvements, Total Cost	20,903
Total Cost	24,142
Accumulated Depreciation	3,025
Total Cost, Net of Accumulated Depreciation	21,117
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2014
Brookfield, WI [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 4,791
Buildings & Improvements, Initial Cost	16,023
Improvements, Initial Cost	0
Land, Total Cost	4,791
Buildings & Improvements, Total Cost	22,109
Total Cost	26,900
Accumulated Depreciation	5,322
Total Cost, Net of Accumulated Depreciation	21,578
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
Brown Deer, WI [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 8,465
Buildings & Improvements, Initial Cost	32,652
Improvements, Initial Cost	0
Land, Total Cost	8,465
Buildings & Improvements, Total Cost	38,266
Total Cost	46,731
Accumulated Depreciation	8,906
Total Cost, Net of Accumulated Depreciation	37,825
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2013
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	1,703
Buildings & Improvements, Total Cost	12,696
Total Cost	14,399
Accumulated Depreciation	5,789
Total Cost, Net of Accumulated Depreciation	8,610
Encumbrances	$ 0
Date of Construction (C) Acquisition (A)	2003
Portfolio Balance (DDR) - unencumbered [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	$ 47,559
Buildings & Improvements, Initial Cost	196,500
Improvements, Initial Cost	0
Land, Total Cost	47,559
Buildings & Improvements, Total Cost	196,500
Total Cost	244,059
Accumulated Depreciation	91,096
Total Cost, Net of Accumulated Depreciation	152,963
Encumbrances	0
Portfolio Balance (DDR) - encumbered [Member]
Real Estate And Accumulated Depreciation [Line Items]
Land, Initial Cost	0
Buildings & Improvements, Initial Cost	3,844
Improvements, Initial Cost	0
Land, Total Cost	0
Buildings & Improvements, Total Cost	3,844
Total Cost	3,844
Accumulated Depreciation	0
Total Cost, Net of Accumulated Depreciation	3,844
Encumbrances	$ 0

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