Derivatives and Hedging (Summary Of Fair Value Interest Rate Contract Hedging Activity) (Details) (Interest Rate Contracts [Member], Interest Expense, Net [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Reduction in interest expense on derivatives related to terminated contracts			$ 6,700,000
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	3,152,000	7,748,000	24,483,000	[1]
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 0	$ 0	$ 964,000	[1]

[1] For the year ended December 31, 2010, we recognized a net reduction in interest expense of $6.7 million related to fair value hedges that were terminated during 2010, which includes net settlements and any amortization adjustment of the basis of the hedged item.