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INCOME TAXES - EFFECTIVE TAX RATE RECONCILIATION (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
Enhanced oil recovery credit and other general business credits	0.00%	(2.00%)	(3.00%)
Goodwill impairment	(3.00%)	0.00%	0.00%
Tax benefit due to reversal of indefinite reinvestment assertion	0.00%	0.00%	(2.00%)
Tax impact from foreign operations	(4.00%)	135.00%	11.00%
State income taxes, net of federal benefit	0.00%	14.00%	1.00%
Uncertain tax positions	0.00%	7.00%	0.00%
Transaction costs	0.00%	10.00%	0.00%
Non-controlling interest	0.00%	(8.00%)	0.00%
Executive compensation limitation	0.00%	12.00%	0.00%
Stock warrants	0.00%	(5.00%)	0.00%
WES loss of control	0.00%	58.00%	0.00%
Other	0.00%	1.00%	(2.00%)
Worldwide effective tax rate	14.00%	243.00%	26.00%

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