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Investment in Investees (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]              
Carrying Value $ 4,947   $ 4,947     $ 5,230  
Equity in net loss of investees (385) $ (145) (284) $ 2,240      
Corporate Segment [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Percentage         31.20%   31.20%
Carrying Value $ 3,259   $ 3,259   $ 3,531   $ 3,816
Carrying Value         $ 4,947   $ 5,230
Sale of Stock, Price Per Share $ 0.72   $ 0.72        
Effect on Future Cash Flows, Amount     $ 1,300