Income Taxes (Reconciliation Of Provision For Income Taxes) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Consolidated tax provision at federal statutory rate (in hundredths)	35.00%	35.00%	35.00%
State income tax provisions, net of federal income tax benefit (in hundredths)	(2.70%)	2.40%	4.00%
Noncontrolling interest (in hundredths)	(0.60%)	(2.50%)	(1.10%)
Tax reserve adjustment (in hundredths)	(1.10%)	(5.40%)	(4.00%)
Changes in certain deferred tax balances (in hundredths)	(4.00%)	3.10%	(2.70%)
IRS audit adjustments (in hundredths)	3.20%
Federal research and development credit (in hundreths)	(3.20%)
Reversal of tax credits (in hundreths)			4.40%
Non-deductible transaction costs (in hundreths)	2.00%
All other, net (in hundredths)	0.40%	0.40%	0.30%
Effective tax rate (in hundredths)	29.00%	33.00%	35.90%