Income Taxes - Reconciliation (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of United States federal statutory rate to effective income tax rate
Statutory tax rate	35.00%	35.00%	35.00%
Foreign tax rate differential	(11.60%)	(3.60%)	(12.10%)
Permanent differences	8.20%	(2.00%)	9.60%
Tax contingencies	(3.00%)	2.30%	(0.90%)
Change in tax rates	0.20%	1.30%	(1.60%)
Withholding taxes	1.30%	8.10%	0.60%
State income taxes, net of federal benefits	(2.90%)	(0.90%)	0.20%
Purchase accounting	1.60%	0.80%	0.70%
Tax credits	(3.00%)	(1.10%)	(4.30%)
Other	4.30%	(2.70%)	(1.20%)
Change in valuation allowance for unbenefitted losses	(17.10%)	(19.20%)	15.20%
Effective tax rate	13.00%	18.00%	41.20%

No definition available.

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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.

+ References

No definition available.

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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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