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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory federal rate | 21.00% | 21.00% | 21.00%
Computed federal income tax expense (benefit) at applicable statutory rate of 21% | $ 11,323 | $ (2,778) | $ 461
State income tax benefit | (283) | (1,448) | (2,241)
Tax credits | (2,507) | (2,391) | (1,064)
Tax effect of international items | (281) | 4,705 | 1,325
Uncertain tax positions | 401 | (455) | (574)
Deferred compensation insurance assets | (413) | (290) | (493)
Stock-based compensation | (5,571) | (1,822) | (1,659)
Valuation allowance |  | 1,257 |
DOJ Settlement |  | 1,890 |
Remeasurement of state deferred taxes | (526) | (1,765) |
Non-deductible expenses | 2,455 | 1,077 | 1,320
Remeasurement of contingent consideration liabilities | 733 | (1,185) | (87)
Other - including the effect of graduated rates | 132 | (183) | (246)
Total income tax expense (benefit) | $ 5,463 | $ (3,388) | $ (3,258)

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