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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current provision (benefit) |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 9,464 | $ 8,760 | $ 5,619
State and other |  |  |  |  |  |  |  |  | (13,104) | 1,474 | (13,968)
Current Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (3,640) | 10,234 | (8,349)
Deferred provision (benefit) |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 312,288 | 277,895 | 232,969
State and other |  |  |  |  |  |  |  |  | 22,499 | 33,804 | (9,200)
Deferred Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 334,787 | 311,699 | 223,769
Income tax expense (benefit) | $ 140,549 | $ 83,865 | $ 71,820 | $ 34,913 | $ 145,288 | $ 71,507 | $ 64,303 | $ 40,834 | 331,147 | $ 321,933 | 215,420
Valuation allowance adjustment |  |  |  |  |  |  |  |  | $ 44,200 |  | $ 215,420

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