INCOME TAXES - Reconciliation of Tax of Income Before Income Taxes and Total Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Income tax expense (benefit) at U.S. statutory rate	$ 16,756	$ (267,540)	$ (2,255)
State tax expense (benefit)	0	(2,610)	818
CARES Act tax impact	(266)	0	0
Valuation allowance	(620)	130,988	(8,177)
All other, net	2	97	4
Total	(696)	64,900	(10,501)
Preferred Unit limited partners
Income Tax [Line Items]
Income tax expense (benefit) attributable to noncontrolling interest	(12,892)	205,844	(891)
Redeemable Common Stock
Income Tax [Line Items]
Income tax expense (benefit) attributable to noncontrolling interest	$ (3,676)	$ (1,879)	$ 0