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Real Estate (Real Estate Held for Sale) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
property
Real Estate [Abstract]    
Number of properties classified as held for sale | property 3 6
Number of properties sold | property 3  
Land and improvements $ 2,207 $ 10,808
Building and improvements 1,655 27,802
Real estate held-for-sale 3,862 38,610
Less accumulated depreciation and amortization (619) (7,499)
Less impairment (2,955) (14,964)
Real estate held for sale $ 288 $ 16,147