EQUITY-BASED COMPENSATION - Equity Options Changed During Period (Details) - Equity options - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Equity Options
Beginning balance (in shares)	3,797,319
Granted (in shares)	0	0
Forfeited (in shares)	(22,437)
Expired (in shares)	(231,943)
Ending balance (in shares)	3,542,939	3,797,319
Ending balance, exercisable (in shares)	3,539,564
Nonvested at end of period (in shares)	3,375
Weighted-average Exercise Price
Beginning balance (in dollars per share)	$ 15.95
Forfeited (in dollars per share)	18.28
Expired (in dollars per share)	14.27
Ending balance (in dollars per share)	16.05	$ 15.95
Ending balance, exercisable	15.22
Nonvested at end of period (in dollar per share)	$ 22.22
Weighted-average Remaining Contractual Term (Years)
Outstanding	3 years 3 months 18 days	4 years 2 months 12 days
Ending balance, exercisable	3 years 3 months 18 days
Aggregate Intrinsic Value
Beginning balance, outstanding	$ 509
Ending balance, outstanding		$ 509