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, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 164,667 $ 165,203
Portion due within one year (1,938) (2,058)
Unamortized debt issuance costs (1,619) (1,712)
Unamortized discount, net (1,149) (1,216)
Long-term debt 159,961 160,217
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 0
Promissory notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 19,564 19,980
Other    
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 275 $ 395