Income Taxes (Provision For Income Tax Rate To Statutory Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Provision at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	1.80%	1.80%	1.70%
Foreign rate differential	(0.60%)	(0.40%)	(0.60%)
Domestic manufacturing deduction	(2.10%)	(2.10%)	(2.10%)
Research and development credit	(0.40%)	(0.40%)	(0.40%)
Unrecognized tax benefits including interest and penalties	(1.30%)	1.10%	0.20%
Valuation allowance adjustments	0.10%	(0.10%)	(0.10%)
Adjustments for previously accrued taxes	0.20%	(0.10%)	(0.30%)
Other	(0.30%)	(0.20%)	0.80%
Provision for income taxes	32.40%	34.60%	34.20%