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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Real estate balance, beginning of the year $ 1,534,599,000 $ 1,496,429,000 $ 1,550,027,000
Properties transferred to held for sale (61,505,000) (15,971,000) (96,596,000)
Property acquisitions 6,481,000 30,997,000 39,456,000
Property dispositions   (4,332,000)  
Improvements and betterments 29,107,000 29,752,000 15,672,000
Write-off fully-depreciated assets   (2,276,000) (12,130,000)
Real estate balance, end of the year 1,508,682,000 [1] 1,534,599,000 1,496,429,000
Accumulated depreciation balance, beginning of the year 341,943,000 313,070,000 300,832,000
Properties transferred to held for sale (14,886,000) (4,131,000) (11,280,000)
Property dispositions   (1,048,000)  
Depreciation expense [2] 34,912,000 36,328,000 35,648,000
Write-off fully-depreciated assets   (2,276,000) (12,130,000)
Accumulated depreciation balance end of the year 361,969,000 341,943,000 313,070,000
Net book value 1,146,713,000 $ 1,192,656,000 $ 1,183,359,000
Amount of encumbrance 47,700,000    
Difference between recorded cost of real estate and cost for federal tax purposes $ 34,100,000    
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, 2018, the aggregate cost for federal income tax purposes was approximately $34.1 million greater 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.