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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed federal income tax expense at applicable statutory rate of 21% |  |  |  |  |  |  |  |  | $ (2,778) | $ 461 | $ 10,399
State income tax expense (benefit) |  |  |  |  |  |  |  |  | (1,448) | (2,241) | (59)
Tax credits |  |  |  |  |  |  |  |  | (2,098) | (1,567) | (1,734)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (1,230) | (1,536) | (1,361)
Uncertain tax positions |  |  |  |  |  |  |  |  | (576) | (794) | 267
Deferred compensation insurance assets |  |  |  |  |  |  |  |  | (299) | (503) | 186
Transaction-related expenses |  |  |  |  |  |  |  |  |  | 154 | 223
U.S. transition tax |  |  |  |  |  |  |  |  |  |  | (3,271)
TCJA remeasurement of deferred taxes |  |  |  |  |  |  |  |  |  |  | (71)
Stock-based payments |  |  |  |  |  |  |  |  | (1,815) | (1,654) | (4,278)
Net GILTI |  |  |  |  |  |  |  |  | 3,960 | 1,861 | 347
Foreign withholding tax |  |  |  |  |  |  |  |  | 228 | 638 | 5,590
Foreign permanent differences |  |  |  |  |  |  |  |  | 1,728 | 937 | 96
Valuation allowance |  |  |  |  |  |  |  |  | 1,879 | 131 | 21
DOJ Settlement |  |  |  |  |  |  |  |  | 1,890 |  |
Remeasurement of state deferred taxes |  |  |  |  |  |  |  |  | (1,765) |  |
Other - including the effect of graduated rates |  |  |  |  |  |  |  |  | (1,064) | 855 | 1,147
Total income tax expense (benefit) | $ (2,133) | $ 825 | $ (3,242) | $ 1,162 | $ (3,757) | $ (2,292) | $ 2,140 | $ 651 | $ (3,388) | $ (3,258) | $ 7,502

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