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, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total principal balance on borrowings $ 161,989 $ 162,405
Portion due within one year (17,901) (18,317)
Unamortized debt issuance costs (1,219) (1,320)
Unamortized discount, net (865) (936)
Long-term debt 142,004 141,832
7.750% Senior Notes    
Debt Instrument [Line Items]    
Total principal balance on borrowings 144,088 144,088
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 $ 17,901 $ 18,317