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
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 165,718 $ 208,446
Portion due within one year (2,158) (2,736)
Unamortized debt issuance costs (1,803) (2,067)
Unamortized discount, net (1,281) (1,469)
Long-term debt 160,476 202,174
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 0 39,000
Promissory notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 20,395 21,642
Other    
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 495 $ 2,976