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Income Taxes - Additional Information (Details) € in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 29, 2012 EUR (€) | Jul. 31, 2018 USD ($) | Jul. 31, 2018 EUR (€) | Oct. 31, 2015 EUR (€) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Dec. 31, 2013 audit | Dec. 31, 2017 EUR (€)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition tax for accumulated foreign earnings, provisional income tax expense |  |  |  |  |  |  |  | $ 149,800,000 |  |  |  |  |  |  |
Transition tax for accumulated foreign earnings, provisional liability |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |
Provisional income tax expense (benefit) |  |  |  |  |  |  |  | (66,900,000) |  |  |  |  |  |  |
Change in tax rate, deferred tax asset, provisional income tax expense (benefit), net of adjustments |  |  |  |  |  |  |  | (70,700,000) |  |  |  |  |  |  |
Benefit from release of valuation allowance for state conformity |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  | $ 88,889,000 |  |  | $ 42,028,000 | 91,421,000 | $ 14,934,000 |  |  |  |
Foreign Tax Authority | Tax Authority, Spain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tax audits (audit) | audit |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Letters of credit outstanding, amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 33,282
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | $ 42,100,000 | € 37,610 |  |
Income taxes paid | $ 34,500,000 |  |  |  |  |  | € 29,600 |  |  |  |  |  |  |  |
Tax Year 2006 Through 2008 | Foreign Tax Authority | Tax Authority, Spain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible loss from tax audits | 12,900,000 | € 11,051 |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Year 2008 Through 2010 | Foreign Tax Authority | Tax Authority, Spain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible loss from tax audits | 20,000,000 |  |  |  | € 17,187 |  |  |  |  |  |  |  |  |  |
Tax Year 2011 Through 2013 | Foreign Tax Authority | Tax Authority, Spain | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible loss from tax audits |  |  | $ 4,740,000 | € 4,066 |  |  |  |  |  |  |  |  |  |  |
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | $ 0 |  |  |  |  | $ 0 |  | $ 39,505,000 |  | $ 0 |  |  |  |  |

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