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INCOME TAXES - EFFECTIVE TAX RATE RECONCILIATION (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% | 35.00%
Enhanced oil recovery credit and other general business credits | (4.00%) | (3.00%) | (9.00%)
Change in federal income tax rate | 0.00% | 0.00% | (44.00%)
Tax (benefit) expense due to reversal of indefinite reinvestment assertion | 0.00% | (2.00%) | 7.00%
Tax impact from foreign operations | 187.00% | 11.00% | 12.00%
State income taxes, net of federal benefit | 28.00% | 1.00% | 2.00%
Uncertain tax positions | 13.00% | 0.00% | 0.00%
Transaction costs | 19.00% | 0.00% | 0.00%
Non-controlling interest | (16.00%) | 0.00% | 0.00%
Executive compensation limitation | 24.00% | 0.00% | 0.00%
Stock warrants | (9.00%) | 0.00% | 0.00%
WES loss of control | 113.00% | 0.00% | 0.00%
Other | (3.00%) | (2.00%) | (2.00%)
Worldwide effective tax rate | 373.00% | 26.00% | 1.00%

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