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Investments (Narrative) (Details) - RLJE [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Jun. 20, 2017
Jun. 16, 2017
Jan. 30, 2017
Oct. 14, 2016
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Face Amount           $ 65,000
Investment Warrants, Exercise Price   $ 3.00        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investment Transferred from Available-for-sale to Equity Method, before Tax $ 500 $ 1,900        
Minimum [Member]            
Schedule of Equity Method Investments [Line Items]            
Warrants Received per RLJE Investment Agreement           20,000,000
Tranche A Loan [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Face Amount         $ 13,000 $ 5,000
Shares Acquired from Exercise of Warrants     1,667,000      
Tranche B Loan [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Face Amount     $ 55,000     $ 60,000
Loan Forgiven in Lieu of Exercise Price for Warrants Exercised     $ 5,000      
Amended Tranche A Loan [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Face Amount         $ 8,000  
Tranche A-2 Loan [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Face Amount       $ 10,000