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Income Taxes Components of current and deferred 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 provision (benefit) |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ (44,462) | $ 81,101 | $ 9,464
State and other |  |  |  |  |  |  |  |  | 7,202 | (11,801) | (13,104)
Current Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (37,260) | 69,300 | (3,640)
Deferred provision (benefit) |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 271,544 | 444,695 | 312,288
State and other |  |  |  |  |  |  |  |  | 91,233 | (22,388) | 22,499
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 362,777 | 422,307 | 334,787
Income tax expense (benefit) | $ 91,842 | $ 95,153 | $ 85,081 | $ 53,440 | $ 331,352 | $ 90,710 | $ 21,798 | $ 47,747 | $ 325,517 | $ 491,607 | $ 331,147

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