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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Valuation allowance | $ 25,690 | $ 26,009
Unrecognized tax benefits that would impact effective tax rate | 50,400 |
Unrecognized tax benefits, income tax penalties and interest expense | 1,300 |
Accrued interest and penalties | 5,100 | $ 3,800
Expected decrease of unrecognized tax benefits | 2,300 |
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax benefit | 379,000 |
Tax Cuts and Jobs Act of 2017, mandatory repatriation tax on foreign earnings | 110,700 |
Tax Cuts and Jobs Act of 2017, estimated charge due to modified territorial taxation system | 28,700 |
Tax Cuts and Jobs Act of 2017, write off of foreign tax credits | 24,200 |
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 29,200 |
Valuation allowance | 9,500 |
Internal Revenue Service (IRS) | Research Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 11,300 |
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 26,100 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 22,000 |
Valuation allowance | $ 16,200 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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