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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed federal income tax expense at applicable statutory rate |  |  |  |  |  |  |  |  | $ 461 | $ 10,399 | $ 12,559
State income taxes |  |  |  |  |  |  |  |  | (2,241) | (59) | 279
Tax credits |  |  |  |  |  |  |  |  | (1,567) | (1,734) | (1,377)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (1,536) | (1,361) | (3,329)
Uncertain tax positions |  |  |  |  |  |  |  |  | (794) | 267 | (19)
Deferred compensation insurance assets |  |  |  |  |  |  |  |  | (503) | 186 | (479)
Transaction-related expenses |  |  |  |  |  |  |  |  | 154 | 223 | 90
U.S. transition tax |  |  |  |  |  |  |  |  |  | (3,271) | 10,612
TCJA remeasurement of deferred taxes |  |  |  |  |  |  |  |  |  | (71) | (8,383)
Stock-based payments |  |  |  |  |  |  |  |  | (1,654) | (4,278) | (2,264)
Bargain purchase gain |  |  |  |  |  |  |  |  |  |  | (1,570)
In-process research and development |  |  |  |  |  |  |  |  |  |  | 1,486
Net GILTI |  |  |  |  |  |  |  |  | 1,861 | 347 |
Foreign withholding tax |  |  |  |  |  |  |  |  | 638 | 5,590 |
Other - including the effect of graduated rates |  |  |  |  |  |  |  |  | 1,923 | 1,264 | 753
Total income tax expense (benefit) | $ (3,757) | $ (2,292) | $ 2,140 | $ 651 | $ 3,022 | $ 2,766 | $ 624 | $ 1,090 | $ (3,258) | $ 7,502 | $ 8,358

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