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INCOME TAXES - EFFECTIVE TAX RATE RECONCILIATION (Details) | 12 Months Ended
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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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