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LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 11, 2018
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Total   $ 483,335 $ 412,682
Less: current portion of long-term debt   (4,007) (3,293)
Less: unamortized debt discounts   (3,263) (3,300)
Less: deferred financing costs   (3,562) (3,994)
Total long-term debt   472,503 402,095
Syndicate of Lenders | Line of Credit      
Debt Instrument [Line Items]      
Total   $ 390,840 $ 322,666
Interest rate during period   7.41% 7.53%
Syndicate of Lenders | Line of Credit | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   5.00% 5.00%
Syndicate of Lenders | Line of Credit | Term Loan | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 5.00%    
Goldman Sachs Specialty Lending Group | Line of Credit      
Debt Instrument [Line Items]      
Interest rate during period   10.50% 10.50%
Goldman Sachs Specialty Lending Group | Line of Credit | Payment-in-Kind Interest Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   5.00% 5.00%
Goldman Sachs Specialty Lending Group | Line of Credit | Term Loan      
Debt Instrument [Line Items]      
Total   $ 92,495 $ 90,016