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Real Estate (Held for Sale) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
property
Real Estate [Abstract]    
Number of properties classified as held for sale | property 4 6
Number of properties sold | property 2  
Land and improvements $ 2,520 $ 3,326
Building and improvements 3,721 5,538
Real estate held-for-sale 6,241 8,864
Less accumulated depreciation and amortization (1,317) (1,677)
Less impairment (1,615) (778)
Real estate held for sale $ 3,309 $ 6,409