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Income Taxes - (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Statutory tax rate (as a percent) |  | 21.00% |  |  | 35.00% |  | 28.10%
Transition Tax |  |  | $ 64,573 |  |  |  |
Net impact on U.S. deferred tax assets and liabilities |  |  | (8,361) |  |  |  |
Net discrete impacts of the enactment of the Tax Act |  |  | 56,212 |  |  |  |
Foreign earnings expected to be repatriated deferred tax liability |  |  | 15,000 |  | $ 15,000 |  |
Payment period of transition tax liability |  |  |  |  | 8 years |  |
Income before income taxes |  |  | 12,865 | $ 6,712 | $ 28,010 | $ 7,653 |
Income tax expense |  |  | $ 59,816 | $ 1,879 | $ 64,804 | $ 2,143 |
Forecast |  |  |  |  |  |  |
Statutory tax rate (as a percent) | 21.00% |  |  |  |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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