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Income Taxes Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, Federal statutory	35.00%	35.00%	35.00%
Effective income tax rate reconciliation, foreign income taxes	(28.30%)	(20.50%)	(17.60%)
Effective income tax rate reconciliation, change in enacted tax rate	(31.60%)	(0.20%)	0.00%
Effective Income Tax Rate Reconciliation, Transition Tax	31.90%	0.00%	0.00%
Effective income tax rate reconciliation, State and local	(1.90%)	0.00%	0.10%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(2.60%)	(1.10%)	(1.30%)
Effective income tax rate reconciliation, valuation allowance	(1.80%)	0.40%	2.60%
Effective income tax rate reconciliation, U.S. tax on unremitted foreign earnings	(5.50%)	0.20%	0.20%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent	4.00%	0.50%	(5.70%)
Effective income tax rate reconciliation, other	1.50%	5.20%	0.30%
Effective income tax rate	0.70%	19.50%	13.60%

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Effective Income Tax Rate Reconciliation, Transition Tax

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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 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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