Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT - Schedule of Long-Term Debt (Details)

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LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt $ 220,897 $ 236,376
Less: portion due within one year (2,191) (2,139)
Less: debt discount, net (1,529) (1,703)
Less: unamortized debt issuance costs (2,152) (2,395)
Total long-term debt 215,025 230,139
Senior Notes    
Debt Instrument [Line Items]    
7.750% Senior Notes (excluding unamortized discount) 144,828 144,828
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Long-term debt 51,000 65,000
Promissory notes    
Debt Instrument [Line Items]    
Long-term debt 21,919 23,166
Other    
Debt Instrument [Line Items]    
Long-term debt $ 3,150 $ 3,382