EQUITY-BASED COMPENSATION - Equity Options Changed During Period (Details) - Equity options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Equity Options
Beginning balance (in shares)	3,797,319
Granted (in shares)	0	0
Forfeited (in shares)	(20,091)
Ending balance (in shares)	3,777,228	3,797,319
Ending balance, exercisable (in shares)	3,764,205
Nonvested at end of period (in shares)	13,023
Weighted-average Exercise Price
Beginning balance (in dollars per share)	$ 15.95
Forfeited (in dollars per share)	14.68
Ending balance (in dollars per share)	15.96	$ 15.95
Ending balance, exercisable	15.94
Nonvested at end of period (in dollar per share)	$ 20.58
Weighted-average Remaining Contractual Term (Years)
Outstanding	4 years	4 years 2 months 12 days
Ending balance, exercisable	4 years
Aggregate Intrinsic Value
Beginning balance, outstanding	$ 509
Ending balance, outstanding		$ 509