SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of (Loss) Income per Basic and Diluted Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended					6 Months Ended			9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Mar. 19, 2019	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020
Accounting Policies [Abstract]
Net (loss) income attributable to common shareholders – basic and diluted (a)	$ (22,447)	[1]	$ 2,362	[1]	$ (25,459)	$ (16,712)	$ (16,712)	[1]	$ (252,516)	[1]
Weighted average shares outstanding:
Basic	84,968		61,118			61,118	61,118		70,737
Diluted	84,968		75,012			61,118	61,118		70,737
(Loss) income per share Voting and Non-Voting:
Basic	$ (0.26)		$ 0.04			$ (0.27)	$ (0.27)		$ (3.57)
Diluted	$ (0.26)		$ 0.03			$ (0.27)	$ (0.27)		$ (3.57)

[1] Calculated as total net loss less amounts attributable to noncontrolling interest.