Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Abstract]
Consolidated tax provision at federal statutory rate (in hundredths)	35.00%	35.00%	35.00%	35.00%
State income tax provisions, net of federal income tax benefit (in hundredths)	1.10%	(1.50%)	1.10%	(4.10%)
Tax reserve adjustment (in hundredths)	5.50%	(1.30%)	0.60%	(6.60%)
Domestic production activities deduction (in hundreths)	(16.90%)		(5.30%)
Changes in certain deferred tax balances (in hundredths)		(11.50%)	(1.70%)	1.50%
IRS audit adjustments (in hundredths)				7.30%
Federal research and development credit (in hundreths)	(7.80%)		(2.40%)
All other, net (in hundredths)	2.00%	(1.40%)	0.60%	(0.60%)
Effective tax rate (in hundredths)	18.90%	19.30%	27.90%	32.50%