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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Valuation Allowance [Line Items] |  |  |  |  |
Deferred Tax Assets, Gross | $ 140,500 |  |  |  | $ 105,000
Deferred Tax Assets, Valuation Allowance | 66,600 |  |  |  | $ 16,000
Deferred Tax Assets, Net | 73,900 |  |  |  |
Provision for (benefit from) income taxes | (3,229) |  | $ 7,376 |  |
Unrecognized tax benefits | 24,000 | $ 22,600 |  | $ 22,600 |
Portion of unrecognized tax benefits, which if recognized, would be recorded as an income tax benefit | 2,400 |  |  |  |
Unrecognized tax benefits included in long-term income taxes payable | 2,400 | 2,200 |  | 2,200 |
Unrecognized tax benefits, reduction of long-term deferred tax assets | 21,600 | 20,400 |  | $ 20,400 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 15,600 | $ 21,500 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  | 35.00% |
Foreign Tax Credit [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 37,100 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |
Income Taxes Paid | $ 6,100 |  | $ 5,500 |  |

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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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