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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 21
State |  |  |  |  |  |  |  |  | 424 | 111 | 12
Foreign |  |  |  |  |  |  |  |  | (158) | 261 | 0
Total Current Income Tax Benefit |  |  |  |  |  |  |  |  | 266 | 372 | 33
Deferred expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 29,928 | 44,075 | 10,534
State |  |  |  |  |  |  |  |  | (185) | 228 | (240)
Foreign |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense from continuing operations | $ 37,674 | $ 3,645 | $ 2,242 | $ 1,114 | $ (14,307) | $ 11,864 | $ 22,419 | $ 10,033 | $ 30,009 | $ 44,675 | $ 10,327

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