Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 178,282 $ 208,446
Portion due within one year (2,257) (2,736)
Unamortized debt issuance costs (1,893) (2,067)
Unamortized discount, net (1,345) (1,469)
Long-term debt 172,787 202,174
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 12,000 39,000
Promissory notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 20,811 21,642
Other    
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 643 $ 2,976