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Derivatives - Interest Rate Swap Agreements (Schedule of Interest Rate Swap Agreements on Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Accumulated other comprehensive income, Ending balance	$ (111,789)	$ (56,221)
Interest Rate Swap [Member]
Accumulated other comprehensive income, Beginning balance	(47,676)	(35,742)
Unrealized loss on interest rate swaps	(109,687)	(80,351)
Reclassification of net losses included in income statement	44,412	68,417
Accumulated other comprehensive income, Ending balance	$ (112,951)	$ (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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