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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current income tax (benefit) expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 120,968 | $ 63,642 | $ (62,829)
State |  |  |  |  |  |  |  |  | 72,837 | 48,558 | (4,750)
Foreign |  |  |  |  |  |  |  |  | 1,815 | 1,345 | 409
Total current income tax expense (benefit) |  |  |  |  |  |  |  |  | 195,620 | 113,545 | (67,170)
Deferred income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 40,057 | 25,296 | 199,858
State |  |  |  |  |  |  |  |  | (6,201) | 1,883 | 60,437
Foreign |  |  |  |  |  |  |  |  | 0 | (213) | 919
Total deferred income tax expense |  |  |  |  |  |  |  |  | 33,856 | 26,966 | 261,214
Income tax expense | $ 89,229 | $ 42,624 | $ 39,355 | $ 58,268 | $ 50,403 | $ 13,321 | $ 39,632 | $ 37,155 | $ 229,476 | $ 140,511 | $ 194,044

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