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Schedule III - Real Estate And Accumulated Depreciation (Changes In Real Estate And Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real estate balance, beginning of the year $ 1,413,402,000 [1] $ 1,316,927,000 [1] $ 1,237,068,000 [1]
Property acquired 34,666,000 [1] 76,185,000 [1] 46,863,000 [1]
Land parcel sold (1,351,000) [1]    
Improvements and betterments 12,133,000 [1] 20,389,000 [1] 33,164,000 [1]
Write-off fully-depreciated assets (18,996,000) [1] (99,000) [1] (168,000) [1]
Real estate balance, end of the year 1,439,854,000 [1],[2] 1,413,402,000 [1] 1,316,927,000 [1]
Accumulated depreciation balance, beginning of the year 229,535,000 [1] 189,608,000 [1] 151,008,000 [1]
Depreciation expense 41,066,000 [1],[3] 40,026,000 [1],[3] 38,768,000 [1],[3]
Write-off of fully-depreciated assets (18,996,000) [1] (99,000) [1] (168,000) [1]
Accumulated depreciation balance end of the year 251,605,000 [1] 229,535,000 [1] 189,608,000 [1]
Net book value 1,188,249,000 [1] 1,183,867,000 [1] 1,127,319,000 [1]
Difference between recorded cost of real estate and cost for federal tax purposes $ 4,500,000    
Minimum [Member]
      
Estimated useful life of buildings and improvements 3 years    
Maximum [Member]
      
Estimated useful life of buildings and improvements 40 years    
[1] Restated to reflect the reclassifications of properties to "real estate held for sale/conveyance" during 2013.
[2] At December 31, 2013, the aggregate cost for federal income tax purposes was approximately $4.5 million less than the Company's recorded values.
[3] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.