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Real Estate (Held for Sale) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 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 $ 1,259 $ 13,796
Building and improvements 1,603 15,535
Real estate held-for-sale 2,862 29,331
Less accumulated depreciation and amortization (521) (3,105)
Less impairment 0 (2,748)
Real estate held for sale $ 2,341 $ 23,478