INCOME TAXES - Reconciliation of Tax of Income Before Income Taxes and Total Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Income tax benefit at U.S. statutory rate	$ (267,540)	$ (2,255)	$ (4,037)
State tax expense (benefit)	(2,610)	818	1,058
Change in U.S. tax rate	0	0	1,843
Valuation allowance	130,988	(8,177)	8,177
All other, net	97	4	0
Total	64,900	(10,501)	7,041
Preferred Unit limited partners
Income Tax [Line Items]
Income tax expense (benefit) attributable to noncontrolling interest	205,844	(891)	0
Redeemable Common Stock
Income Tax [Line Items]
Income tax expense (benefit) attributable to noncontrolling interest	$ (1,879)	$ 0	$ 0