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Real Estate (Real Estate And Accumulated Depreciation) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cost      
Balance, beginning of year $ 1,476,173,000 $ 1,450,951,000  
Properties held for sale (4,599,000) (81,223,000)  
Properties acquired 65,313,000 91,241,000 $ 34,666,000
Impairments   (6,000) (928,000)
Improvements and betterments 13,140,000 15,210,000 13,581,000
Balance, end of year 1,550,027,000 1,476,173,000 1,450,951,000
Accumulated depreciation      
Balance, beginning of the year 267,211,000 251,605,000  
Properties held for sale (1,380,000) (18,523,000)  
Depreciation expense [1] 35,001,000 34,129,000 41,066,000
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
[1] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.