Income Taxes (Provision For Income Tax Rate To Statutory Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	1.90%	1.80%	1.80%
Foreign rate differential	(0.80%)	(0.60%)	(0.40%)
Domestic manufacturing deduction	(2.20%)	(2.10%)	(2.10%)
Research and development credit	(0.70%)	(0.40%)	(0.40%)
Unrecognized tax benefits including interest and penalties	2.30%	(1.30%)	1.10%
Valuation allowance adjustments	(0.10%)	0.10%	(0.10%)
Deferred remeasurement for rate change	5.50%	0.00%	0.00%
Tax reform territorial tax	(0.10%)	0.00%	0.00%
Adjustments for previously accrued taxes	(1.20%)	0.20%	(0.10%)
Other	0.00%	(0.30%)	(0.20%)
Provision for income taxes	39.60%	32.40%	34.60%