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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Income tax benefit | $ 5,689 | $ 29,721 | $ 13,441 | $ 53,182
Effective tax rates (as a percent) | (78.00%) | (196.50%) |  | (193.20%)
Federal statutory income tax rate (as a percentage) |  |  | 21.00% |
Income tax expense - excluding excess tax benefit on stock compensation | $ 2,034 | $ 3,946 | $ 284 | $ 7,688
Excess tax benefits on stock compensation | $ 7,723 | $ 33,667 | $ 13,725 | $ 60,870

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