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Income Taxes - Benefit (Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Benefit (Provision): |  |  |
Federal | $ 13,869 | $ 22,255 | $ 57,547
State | 2,170 | 6,406 | (2,479)
Foreign |  | 913 | 2,448
Expiration of NOLs and R&D Credit | (18,966) |  |
Income Tax Rate Change |  |  | (99,528)
Income tax benefit (provision) before valuation allowance | (2,927) | 29,574 | (42,012)
Deferred Tax Valuation Allowance | $ 2,927 | (28,809) | 66,294
Income Tax Benefit (Provision) |  | $ 765 | $ 24,282

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