Income Taxes - Reconciliation (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of United States federal statutory rate to effective income tax rate
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate differential	(11.70%)	(11.60%)	(3.60%)
Permanent differences	(0.50%)	8.20%	(2.00%)
Mandatory Repatriation	27.00%
Tax contingencies	(1.30%)	(3.00%)	2.30%
Change in tax rates (as a percent)	0.90%	0.20%	1.30%
Withholding taxes	2.20%	1.30%	8.10%
Permanent Reinvestment Assertion Accrual	7.80%
State income taxes, net of federal benefits	1.30%	(2.90%)	(0.90%)
Purchase accounting	0.50%	1.60%	0.80%
Tax credits	(0.30%)	(3.00%)	(1.10%)
Other	(1.20%)	4.30%	(2.70%)
Change in valuation allowance for unbenefitted losses	(0.30%)	(17.10%)	(19.20%)
Effective tax rate	59.40%	13.00%	18.00%

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction received under enacted tax laws for purchase accounting.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to a permanent reinvestment assertion accrual pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income tax withheld from employees' wages and paid directly to the government by the employer.

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No definition available.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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