Financial Instruments And Risk Management (Effect Of Derivative Instruments On The Condensed Consolidated Statements Of Operations Derivatives In Fair Value Hedging Relationships) (Details) (Fair Value Hedging, USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 13,050,000	$ 34,985,000	$ 26,509,000	$ 39,780,000
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	(9,823,000)	(34,985,000)	(16,897,000)	(39,780,000)
Interest expense | Interest rate swaps
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	13,050,000	34,985,000	26,509,000	39,780,000
Interest expense | 2018 Senior Notes
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	$ (9,823,000)	$ (34,985,000)	$ (16,897,000)	$ (39,780,000)