Income Taxes (Provision For Income Tax Rate To Statutory Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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%	1.70%	1.60%
Domestic manufacturing deduction	(2.10%)	(2.10%)	(1.70%)
Research and development credit	(0.40%)	(0.40%)	(0.90%)
Unrecognized tax benefits including interest and penalties	1.10%	0.20%	0.90%
Valuation allowance adjustments	(0.10%)	(0.10%)	(0.30%)
Tax audit settlements	0.00%	0.00%	0.10%
Adjustments for previously accrued taxes	(0.10%)	(0.30%)	(0.20%)
Other	(0.60%)	0.20%	(0.40%)
Provision for income taxes	34.60%	34.20%	34.10%