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Income Taxes Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent | 21.00% | 35.00% | 35.00%
Net income tax benefit | $ 0 | $ 13,894 | $ 0
Income tax benefit from lower foreign tax rates | (19,008) | 25,374 | $ 0
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 20,300 |  |
Tax Cuts and Jobs Act |  |  |
Income Taxes [Line Items] |  |  |
Deferred income tax benefit from change in tax rate |  | 116,200 |
Tax Cuts and Jobs Act - Provisional |  |  |
Income Taxes [Line Items] |  |  |
Net income tax benefit |  | 13,900 |
Deferred tax asset reversal, foreign income tax credits |  | 70,200 |
Current income tax expense, mandatory tax on undistributed earnings |  | 32,100 |
Income tax benefit from lower foreign tax rates |  | $ 25,400 |
Tax Cut and Jobs Act Adjustment |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax asset reversal, foreign income tax credits | 3,600 |  |
Current income tax expense, mandatory tax on undistributed earnings | 1,000 |  |
Foreign Derived Intangible Income (FDII) |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount | $ 4,800 |  |

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