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Real Estate (Real Estate Held for Sale) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Real Estate [Abstract]    
Number of properties classified as held for sale | property 3 8
Number of properties sold | property 5  
Land and improvements $ 3,703 $ 6,908
Building and improvements 4,695 7,610
Real estate held-for-sale 8,398 14,518
Less accumulated depreciation and amortization (2,386) (3,750)
Less impairment (604) (1,107)
Real estate held for sale $ 5,408 $ 9,661