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Real Estate (Held for Sale) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
property
Real Estate [Abstract]    
Number of properties classified as held for sale | property 4 18
Number of properties sold | property 14  
Land and improvements $ 4,116 $ 16,663
Building and improvements 5,981 19,913
Real estate held-for-sale 10,097 36,576
Less accumulated depreciation and amortization (1,340) (3,937)
Less impairment (1,494) (2,997)
Real estate held for sale $ 7,263 $ 29,642