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
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 194,155 $ 208,446
Portion due within one year (2,296) (2,736)
Unamortized debt issuance costs (1,981) (2,067)
Unamortized discount, net (1,408) (1,469)
Long-term debt 188,470 202,174
Senior Notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 144,828 144,828
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Total principal balance on borrowings 27,000 39,000
Promissory notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 21,088 21,642
Other    
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 1,239 $ 2,976