Income Taxes (Reconciliation Of Income Tax Rates) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Foreign tax rate differential	(2.20%)	(1.70%)	(3.00%)
State income tax, net of federal benefit	2.70%	2.60%	4.50%
Nondeductible expenses	1.80%	0.60%	1.40%
Tax credits	(0.90%)	(0.80%)	(2.20%)
Change in liability for unrecognized tax benefits	(0.80%)	(1.90%)	0.90%
Domestic production activities deduction	(2.20%)	(1.20%)	(1.20%)
Other	0.90%	1.00%	2.60%
Effective income tax rate, total	34.30%	33.60%	38.00%