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Income Taxes, Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income tax expense (benefit) |  |  |
Current federal income tax expense (benefit) | $ 92,887 | $ (87,736) | $ 181,579
Current state income tax expense | 8,256 | 11,091 | 11,614
Deferred federal income tax expense (benefit) | 60,939 | 41,851 | (65,970)
Federal - valuation allowance adjustment |  | (10,816) |
Deferred state income tax expense (benefit) | 9,910 | 2,208 | (1,180)
State - valuation allowance adjustment |  | 38,470 |
Total income tax expense (benefit) | $ 171,992 | $ (4,932) | $ 126,043

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