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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Valuation Allowance [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Gross | $ 142,700 |  | $ 142,700 |  | $ 105,000 |
Deferred Tax Assets, Valuation Allowance | 66,900 |  | 66,900 |  | $ 16,000 |
Deferred Tax Assets, Net | 76,000 |  | 76,000 |  |  |
Provision for (benefit from) income taxes | (1,015) | $ 2,507 | (4,244) | $ 9,883 |  |
Unrecognized tax benefits | 23,800 |  | 23,800 |  |  | $ 22,600
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 2,200 |  | 2,200 |  |  |
Unrecognized tax benefits included in long-term income taxes payable | 2,200 |  | 2,200 |  |  | 2,200
Unrecognized tax benefits, reduction of long-term deferred tax assets | 21,600 |  | 21,600 |  |  | $ 20,400
Foreign Tax Authority [Member] |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Income Taxes Paid | $ 5,000 | $ 5,400 | $ 11,100 | $ 10,900 |  |

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- Definition Represents the amount of unrecognized tax benefits which pertained to uncertain tax positions taken in tax returns and was recorded as a reduction of long-term deferred tax assets as of the balance sheet date, prior to reduction for federal tax benefit. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + 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 (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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