Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Company Borrowings (Details)

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LONG-TERM DEBT - Company Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal balance on borrowings $ 165,203 $ 208,446
Portion due with one year (2,058) (2,736)
Unamortized debt issuance costs (1,712) (2,067)
Unamortized discount (1,216) (1,469)
Long-term debt 160,217 202,174
7.750% Senior Notes (excluding unamortized discount)    
Debt Instrument [Line Items]    
7.750% Senior Notes (excluding unamortized discount) 144,828 144,828
Senior secured revolving credit facility    
Debt Instrument [Line Items]    
Principal balance on borrowings 0 39,000
Promissory notes    
Debt Instrument [Line Items]    
Principal balance on borrowings 19,980 21,642
Other    
Debt Instrument [Line Items]    
Principal balance on borrowings $ 395 $ 2,976