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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Real estate balance, beginning of the year $ 1,476,173,000 $ 1,450,951,000 $ 1,423,979,000
Properties held for sale (4,599,000) (81,223,000)  
Properties acquired 65,313,000 91,241,000 34,666,000
Properties sold     (1,351,000)
Impairments   (6,000) (928,000)
Improvements and betterments 13,140,000 15,210,000 13,581,000
Write-off fully-depreciated assets     (18,996,000)
Real estate balance, end of the year 1,550,027,000 [1] 1,476,173,000 1,450,951,000
Accumulated depreciation balance, beginning of the year 267,211,000 251,605,000 229,535,000
Properties held for sale (1,380,000) (18,523,000)  
Depreciation expense [2] 35,001,000 34,129,000 41,066,000
Accumulated depreciation balance end of the year 300,832,000 267,211,000 251,605,000
Net book value 1,249,195,000 $ 1,208,962,000 $ 1,199,346,000
Difference between recorded cost of real estate and cost for federal tax purposes $ 300,000    
Minimum [Member]      
Estimated useful life of buildings and improvements 3 years    
Maximum [Member]      
Estimated useful life of buildings and improvements 40 years    
[1] At December 31, 2015, the aggregate cost for federal income tax purposes was approximately $0.3 million less than the Company's recorded values.
[2] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.