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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit) | $ 5,590 | $ 252,487 | $ 66,293 | $ 298,395
Effective tax rate (percent) | 5.39% | 34.00% | 22.60% | 35.00%
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | $ 2,274,000 |  | $ 2,274,000 |

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