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Real Estate (Real Estate And Accumulated Depreciation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cost      
Balance, beginning of year $ 1,550,027,000 $ 1,476,173,000  
Properties transferred to held for sale (96,596,000) (4,599,000) $ (81,223,000)
Properties acquired 39,456,000 65,313,000 91,241,000
Write-off fully-depreciated assets (12,130,000)    
Improvements and betterments 15,672,000 13,140,000 15,210,000
Balance, end of the year 1,496,429,000 1,550,027,000 1,476,173,000
Accumulated depreciation      
Balance, beginning of the year 300,832,000 267,211,000  
Properties transferred held for sale (11,280,000) (1,380,000) (18,523,000)
Write-off fully-depreciated assets (12,130,000)    
Depreciation expense [1] 35,648,000 35,001,000 34,129,000
Balance, end of the year 313,070,000 300,832,000 267,211,000
Net book value $ 1,183,359,000 $ 1,249,195,000 $ 1,208,962,000
[1] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.