Income Taxes (Reconciliation Of U.S. Federal Statutory Tax Rate To Consolidated Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.60%	1.10%	1.20%
Uncertain tax positions	(0.20%)	(0.40%)	(0.90%)
Research and development credits	(1.00%)	(1.10%)	(1.10%)
Benefit from restructuring activities	(2.20%)	(2.70%)	(4.10%)
Domestic production activity benefit	(3.70%)	(3.10%)	(3.50%)
Other	0.70%	0.40%	0.20%
Consolidated effective tax rate	30.20%	29.20%	26.80%