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Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 1,988 | $ 2,403 | $ (6,475)
State |  |  |  |  |  |  |  |  | 198 | 395 | 281
Foreign |  |  |  |  |  |  |  |  | 905 | 1,391 | 454
Total |  |  |  |  |  |  |  |  | 3,091 | 4,189 | (5,740)
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 24 | (123) | (238)
State |  |  |  |  |  |  |  |  | (64) | 23 | 51
Foreign |  |  |  |  |  |  |  |  | 75 | (97) | (18)
Total |  |  |  |  |  |  |  |  | 35 | (197) | (205)
Total |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 2,012 | 2,280 | (6,713)
State |  |  |  |  |  |  |  |  | 134 | 418 | 332
Foreign |  |  |  |  |  |  |  |  | 980 | 1,294 | 436
Total income tax expense | $ 466 | $ 680 | $ 771 | $ 1,209 | $ 542 | $ 748 | $ 1,548 | $ 1,154 | $ 3,126 | $ 3,992 | $ (5,945)

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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