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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed federal income tax expense at applicable statutory rate |  |  |  |  |  |  |  |  | $ 10,399 | $ 12,559 | $ 8,885
State income taxes |  |  |  |  |  |  |  |  | (59) | 279 | 193
Tax credits |  |  |  |  |  |  |  |  | (1,734) | (1,377) | (1,164)
Production activity deduction |  |  |  |  |  |  |  |  | 0 | 0 | (53)
Foreign tax rate differential |  |  |  |  |  |  |  |  | (1,361) | (3,329) | (3,717)
Uncertain tax positions |  |  |  |  |  |  |  |  | 267 | (19) | 597
Deferred compensation insurance assets |  |  |  |  |  |  |  |  | 186 | (479) | (307)
Transaction-related expenses |  |  |  |  |  |  |  |  | 223 | 90 | 274
U.S. transition tax |  |  |  |  |  |  |  |  | (3,271) | 10,612 | 0
TCJA remeasurement of deferred taxes |  |  |  |  |  |  |  |  | (71) | (8,383) | 0
Stock-based payments |  |  |  |  |  |  |  |  | (4,278) | (2,264) | 0
Bargain purchase gain |  |  |  |  |  |  |  |  | 0 | (1,570) | 0
In-process research and development |  |  |  |  |  |  |  |  | 0 | 1,486 | 0
Net GILTI |  |  |  |  |  |  |  |  | 347 | 0 | 0
Foreign withholding tax |  |  |  |  |  |  |  |  | 5,590 | 0 | 0
Other — including the effect of graduated rates |  |  |  |  |  |  |  |  | 1,264 | 753 | 557
Total income tax expense | $ 3,022 | $ 2,766 | $ 624 | $ 1,090 | $ 4,474 | $ 1,364 | $ 1,830 | $ 690 | $ 7,502 | $ 8,358 | $ 5,265

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