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Income Taxes - Schedule of Income Tax Expense (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 |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 1,938 | $ 1,988 | $ 2,403
State |  |  |  |  |  |  |  |  | 650 | 198 | 395
Foreign |  |  |  |  |  |  |  |  | 1,461 | 905 | 1,391
Total |  |  |  |  |  |  |  |  | 4,049 | 3,091 | 4,189
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (260) | 24 | (123)
State |  |  |  |  |  |  |  |  | 22 | (64) | 23
Foreign |  |  |  |  |  |  |  |  | (186) | 75 | (97)
Total |  |  |  |  |  |  |  |  | (424) | 35 | (197)
Total |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 1,678 | 2,012 | 2,280
State |  |  |  |  |  |  |  |  | 672 | 134 | 418
Foreign |  |  |  |  |  |  |  |  | 1,275 | 980 | 1,294
Total income tax expense | $ 1,173 | $ 505 | $ 631 | $ 1,316 | $ 466 | $ 680 | $ 771 | $ 1,209 | $ 3,625 | $ 3,126 | $ 3,992

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