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Real Estate (Real Estate and Accumulated Depreciation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost      
Balance, beginning of year $ 1,508,682,000 $ 1,534,599,000  
Properties transferred to held for sale (36,265,000) (61,505,000) $ (15,971,000)
Property acquisitions 9,333,000 6,481,000 30,997,000
Asset write-offs (3,633,000)    
Improvements and betterments 37,089,000 29,107,000 29,752,000
Balance, end of the year 1,515,206,000 1,508,682,000 1,534,599,000
Accumulated depreciation      
Balance, beginning of the year 361,969,000 341,943,000  
Properties transferred held for sale (10,143,000) (14,886,000) (4,131,000)
Asset write-offs (3,107,000)    
Depreciation expense [1] 41,142,000 34,912,000 36,328,000
Balance, end of the year 389,861,000 361,969,000 341,943,000
Net book value $ 1,125,345,000 $ 1,146,713,000 $ 1,192,656,000
[1] Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.