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Equity Method Investments (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Gain (loss) on sale of equity method investment   $ (538,000)  
Savoy [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment ownership percentage 30.60%    
Proceeds from the sale of investment $ 8,000,000    
Value of equity method investment sold in period     $ 8,000,000
Proceeds from the sale of investment, net commissions paid   7,500,000  
Gain (loss) on sale of equity method investment   $ 538,000  
Sunrise Energy [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment ownership percentage   50.00%  
Equity method investment   $ 3,700,000 3,900,000
Savoy [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity method investment     $ 8,037,000