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Income Taxes - Summary of Income Tax Benefit (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current |  |  |
Federal | $ (9,531) | $ (9,920) | $ 983
State | 1,816 | (1,848) | (1,397)
Total | (7,715) | (11,768) | (414)
Deferred |  |  |
Federal | (313,938) | (218,357) | (72,869)
State | (7,175) | (12,350) | (99)
Total | (321,113) | (230,707) | (72,968)
Income tax (benefit) expense | $ (328,828) | $ (242,475) | $ (73,382)

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