Fair Value (Schedule Of Quantitative Disclosure Of Key Unobservable Inputs For Auction Rate Securities) (Details)	12 Months Ended
	Dec. 31, 2013
Minimum [Member] | Auction Rate Securities - Municipal Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of discount rates (including basis point liquidity premium)	2.80%
Range of estimated forward rates applied to contractual cash flows	0.10%
Minimum [Member] | Auction Rate Securities - Preferred [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of discount rates (including basis point liquidity premium)	3.10%
Range of estimated forward rates applied to contractual cash flows	0.30%
Maximum [Member] | Auction Rate Securities - Municipal Debt [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of discount rates (including basis point liquidity premium)	9.90%
Range of estimated forward rates applied to contractual cash flows	7.40%
Maximum [Member] | Auction Rate Securities - Preferred [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of discount rates (including basis point liquidity premium)	6.90%
Range of estimated forward rates applied to contractual cash flows	5.10%