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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Liability for unrecognized tax benefits | $ 6,067 |  | $ 6,067 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 489 |  | 489 |  |
Unrecognized tax benefits that would impact the effective tax rate | 5,842 |  | $ 5,842 |  |
Federal Statutory Income Tax Rate, Historical |  |  |  |  | 35.00%
Tax Cuts and Jobs Act of 2017 Corporate Federal Tax Rate |  |  | 21.00% |  |
Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Transition Tax On Accumulated Foreign Earnings, Percent |  |  | (1.30%) |  |
Income Tax Expense | $ 158 | $ 731 | $ 1,598 | $ 385 |
Effective Income Tax Rate Reconciliation, Percent | 1.60% |  | 5.80% |  |
Tax Cuts And Jobs Act Of 2017, Transition Tax Liability For Accumulated Foreign Earnings, Income Tax Expense |  |  | $ (362) |  |
Other Tax Benefits |  |  | $ 3,568 |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Examination, Year under Examination |  |  | 2015 |  |
Minimum |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Examination, Year under Examination |  |  | 2014 |  |
Maximum |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Income Tax Examination, Year under Examination |  |  | 2016 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 + Details
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