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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	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 11,123	$ 4,795
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	(11,123)	(4,795)
2018 Senior Notes [Member] \| Interest Expense [Member]
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items	(11,123)	(4,795)
Interest Rate Swaps [Member] \| Interest Expense [Member]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 11,123	$ 4,795

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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