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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 600 | $ 4,695 | $ 1,866
State |  |  |  |  |  |  |  |  | 0 | 2,098 | 299
Foreign |  |  |  |  |  |  |  |  | (4,817) | (2,743) | (1,847)
Deferred: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 40,634 | 26,074 | 2,473
State |  |  |  |  |  |  |  |  | 1,340 | 1,301 | 103
Foreign |  |  |  |  |  |  |  |  | (2,894) | 1,795 | (506)
Income tax benefit | $ 14,460 | $ 3,610 | $ (370) | $ 15,520 | $ 7,110 | $ 7,780 | $ (8,410) | $ (4,092) | $ 34,863 | $ 33,220 | $ 2,388

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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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