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Real Estate Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Land $ 13,262 $ 13,262
Buildings and improvements 43,074 43,074
Subtotal 56,336 56,336
Less accumulated depreciation and amortization 12,626 12,327
Total $ 43,710 $ 44,009
Minimum    
Schedule of Investments [Line Items]    
Estimated useful life 7 years  
Maximum    
Schedule of Investments [Line Items]    
Estimated useful life 39 years