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Income Taxes - Components of Income Tax Expense (Benefit) (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
Current expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ (1,132) | $ 3,849 | $ 1,933
State |  |  |  |  |  |  |  |  | 582 | 645 | 492
Foreign |  |  |  |  |  |  |  |  | 6,000 | 5,168 | 3,802
Total current expense |  |  |  |  |  |  |  |  | 5,450 | 9,662 | 6,227
Deferred expense (benefit): |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 4,400 | (314) | (144)
State |  |  |  |  |  |  |  |  | (667) | (216) | (195)
Foreign |  |  |  |  |  |  |  |  | (1,681) | (774) | (623)
Total deferred (benefit) expense |  |  |  |  |  |  |  |  | 2,052 | (1,304) | (962)
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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