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Equity Method Investments (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 09, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]            
Equity method investment     $ 3,500 $ 3,500   $ 3,666
Savoy [Member]            
Schedule of Equity Method Investments [Line Items]            
Value of equity method investment sold in period   $ 8,000        
Gain (loss) on sale of equity method investment     $ (538) $ (538) $ (538)  
Sale of Stock, Transaction Date       Mar. 09, 2018    
Sale of Stock, Consideration Received on Transaction   $ 7,500        
Sale of Stock, Percentage of Ownership before Transaction 30.60%          
Sunrise Energy [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity method investment ownership percentage     50.00% 50.00%    
Equity method investment     $ 3,500 $ 3,500   $ 3,700