Income Taxes (Reconciliation Of U.S. Federal Statutory Tax Rate To Consolidated Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.10%	1.20%	1.10%
Stock-based compensation	0.00%	0.60%	0.90%
Net benefit of unrepatriated earnings	0.00%	(0.30%)	(0.90%)
Uncertain tax positions	(0.40%)	(0.90%)	(3.70%)
Research and development credits	(1.10%)	(1.10%)	(2.00%)
Benefit from restructuring activities	(2.70%)	(4.10%)	(2.80%)
Domestic production activity benefit	(3.10%)	(3.50%)	(3.30%)
Other	0.40%	(0.10%)	(0.40%)
Consolidated effective tax rate	29.20%	26.80%	23.90%