Financial Instruments And Risk Management (Effect Of Derivative Instruments On The Condensed Consolidated Statements Of Operations Derivatives In Fair Value Hedging Relationships) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 1,564	$ 11,123	$ 13,459	$ 4,795
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	1,751	(11,123)	(7,074)	(4,795)
Interest expense | Interest rate swap
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	1,564	11,123	13,459	4,795
Interest expense | 2018 Senior Notes
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	$ 1,751	$ (11,123)	$ (7,074)	$ (4,795)