Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract]
Net income (loss)	$ 881,914	$ 645,995	$ (42,267)
Other comprehensive activity:
Hedge fair value changes, net			12,974
Net hedge gains included in continuing operations	(32,636)	(84,877)	(114,231)
Income tax provision	8,407	23,648	50,059
Other comprehensive activity	(24,229)	(61,229)	(51,198)
Comprehensive income (loss)	857,685	584,766	(93,465)
Comprehensive (income) loss attributable to the noncontrolling interests	(33,687)	(23,206)	9,424
Comprehensive income (loss) attributable to common stockholders	$ 823,998	$ 561,560	$ (84,041)

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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