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Notes Payable, Long-Term Debt and Other Obligations (Share Lending Agreement) (Details) - Jefferies & Company [Member] - Share Lending Agreement [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Fair value $ 16,512  
Shares outstanding (in shares) 774,479  
Shares returned (in shares) 805,400  
Unamortized amount of issuance costs $ 1,803 $ 2,140