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Notes Payable, Long-Term Debt and Other Obligations (Share Lending Agreement) (Details) - Jefferies & Company [Member] - Share Lending Agreement [Member] - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Sep. 30, 2016
Nov. 30, 2012
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Lending fee (in dollars per share)   $ 0.1    
Fair value   $ 3,204    
Shares outstanding (in shares)   7,431,606 1,579,879  
Shares returned (in shares) 2,135,923 3,715,804    
Amortized amount into interest expense     $ 466  
Unamortized amount of issuance costs     $ 2,140 $ 2,607