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Income Taxes - Benefit (Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Benefit (Provision): |  |  |
Federal | $ 22,255 | $ 57,547 | $ 45,518
State | 6,406 | (2,479) | 7,268
Foreign | 913 | 2,448 | 1,124
Income Tax Rate Change |  | (99,528) |
Income tax benefit (provision) before valuation allowance | 29,574 | (42,012) | 53,910
Deferred tax valuation allowance | (28,809) | 66,294 | $ (53,910)
Income Tax Benefit (Provision) | $ 765 | $ 24,282 |

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