Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation between the U.S. federal statutory tax rate and effective tax rate
Statutory rate	35.00%	35.00%	35.00%	35.00%
State taxes	0.70%	1.10%	0.60%	1.00%
Taxes on foreign earnings	(11.40%)	(10.10%)	(11.40%)	(9.40%)
Credits and net operating loss utilization	(0.70%)	(1.40%)	(0.80%)	(1.30%)
Purchased intangible assets	1.20%	1.20%	1.30%	1.10%
Manufacturing deduction	(2.00%)	(1.80%)	(2.10%)	(1.70%)
Permanent items	0.60%	0.20%	0.70%	0.50%
Other	0.40%	0.50%	0.60%	0.40%
Effective tax rate	23.80%	24.70%	23.90%	25.60%