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Income Taxes - Benefit (Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax benefit (provision): |  |  |
Federal | $ 16,615 | $ 13,869 | $ 22,255
State | 5,802 | 2,170 | 6,406
Foreign |  |  | 913
Expiration of NOLs and R&D Credit | (20,294) | (18,966) |
Income tax benefit (provision) before valuation allowance | 2,123 | (2,927) | 29,574
Deferred tax valuation allowance | (956) | $ 2,927 | (28,809)
Income tax benefit (provision) | $ 1,167 |  | $ 765

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