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Derivatives - Interest Rate Swap Agreements (Schedule Of Interest Rate Swap Agreements On Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Accumulated other comprehensive loss, Ending balance	$ (212,123)	$ (56,221)
Interest Rate Swap [Member]
Derivative [Line Items]
Accumulated other comprehensive loss, Beginning balance	(47,676)	(35,742)
Unrealized loss on interest rate swaps	(273,389)	(80,351)
Reclassification of net losses included in income statement	102,614	68,417
Accumulated other comprehensive loss, Ending balance	$ (218,451)	$ (47,676)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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