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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Components of the provision for income taxes |  |
Federal | $ 0 | $ 0
State | (965) | (625)
Deferred portion of income tax (expense) benefit | 47,003 | (98,366)
Income tax (expense) benefit | $ 46,038 | $ (98,991)
Effective tax rate | 20.60% | 23.80%

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