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Real Estate (Real Estate And Accumulated Depreciation) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost      
Balance, beginning of year $ 1,534,599,000 $ 1,496,429,000  
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)  
Write-off fully-depreciated assets   (2,276,000) (12,130,000)
Improvements and betterments 29,107,000 29,752,000 15,672,000
Balance, end of the year 1,508,682,000 1,534,599,000 1,496,429,000
Accumulated depreciation      
Balance, beginning of the year 341,943,000 313,070,000  
Properties transferred held for sale (14,886,000) (4,131,000) (11,280,000)
Property dispositions   (1,048,000)  
Write-off fully-depreciated assets   (2,276,000) (12,130,000)
Depreciation expense [1] 34,912,000 36,328,000 35,648,000
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
[1] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.