Derivatives And Hedging (Summary Of Cash Flow Interest Rate Contract Hedging Activity) (Details) (Cash Flow Hedges [Member], Interest Rate Contracts [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ 2,107	$ (16)
Interest Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive into Income (Effective Portion)	(656)	(659)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 0	$ 0