LONG-TERM DEBT - Summary of long-term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 365,000	$ 365,000
Deferred financing fees, net of accumulated amortization	(10,790)	(11,510)
Total credit facilities, net of deferred financing fees	354,210	353,490
Revolving Facility
Debt Instrument [Line Items]
Total long-term debt	115,000	115,000
Term Loan
Debt Instrument [Line Items]
Total long-term debt	$ 250,000	$ 250,000