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Long-term Debt - Obligations (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Apr. 28, 2016
Obligations        
Costs associated with issuances of debt   $ (4,283) $ (5,137)  
Total debt   155,325 158,790  
Current portion of long-term debt and lease obligations   (38,819) (14,581)  
Non-current portion of long-term debt and lease obligations   116,506 144,209  
Senior secured third-priority lien notes reclassified from long-term to current $ 28,500      
Senior secured notes | Senior secured second-priority lien notes (maturing December 15, 2021)        
Obligations        
Gross debt   120,569 120,569  
Total debt       $ 120,600
Senior secured notes | Senior secured third-priority lien notes (maturing May 15, 2018)        
Obligations        
Gross debt   28,497 28,497  
Total debt       $ 28,500
Revolving credit facility        
Obligations        
Gross debt   10,000 10,000  
Revolving credit facility | Other assets        
Obligations        
Costs associated with issuances of debt   (400) (1,200)  
Equipment capital leases        
Obligations        
Gross debt   542 3,446  
Other debt        
Obligations        
Gross debt   $ 0 $ 1,415