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STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Nov. 12, 2019	Feb. 28, 2018	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Weighted-Average Grant Date Fair Value
Award vesting period				4 years
Restricted securities units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expense				$ 21,519	$ 4,536
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized				3 years 21 days	2 years 5 months 1 day
Shares (in thousands)
Unvested — Beginning balance (in shares)				381,000
Granted (in shares)				1,792,000
Vested (in shares)				(324,000)
Forfeited (in shares)				(112,000)
Unvested — Ending balance (in shares)			381,000	1,737,000	381,000
Weighted-Average Grant Date Fair Value
Unvested — Beginning balance (in usd per share)				$ 18.11
Granted (in usd per share)				15.86
Vested (in usd per share)				14.65
Forfeited (in usd per share)				19.02
Unvested — Ending balance (in usd per share)			$ 18.11	$ 16.38	$ 18.11
Performance Shares [Member]
Shares (in thousands)
Vested (in shares)			(850,000)
Forfeited (in shares)					(25,000)
Unvested — Ending balance (in shares)		875,000		1,252,500
Subsequent Event | Restricted stock units
Shares (in thousands)
Granted (in shares)	186,309
Weighted-Average Grant Date Fair Value
Award vesting period	4 years
Compensation not yet recognized, awards other than options	$ 6,800
Maximum | Employees and non-employee directors | Restricted stock units
Weighted-Average Grant Date Fair Value
Award vesting period				4 years

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