Income Taxes (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation between the U.S. federal statutory tax rate and effective tax rate
Statutory rate	21.00%	35.00%	21.00%	35.00%
State taxes	0.60%	0.80%	0.80%	0.40%
Taxes on foreign earnings	0.00%	(11.70%)	(0.40%)	(11.40%)
Credits and net operating loss utilization	(0.70%)	(0.90%)	(0.80%)	(0.80%)
Purchased intangible assets	0.60%	1.40%	0.60%	1.40%
Manufacturing deduction	0.00%	(2.10%)	0.00%	(2.10%)
Permanent items	0.40%	0.70%	0.40%	0.70%
Other	0.50%	0.60%	0.30%	0.80%
Effective tax rate	22.40%	23.80%	21.90%	24.00%

Effective income tax rate reconciliation manufacturing deduction

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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 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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