Income Taxes (Income (Loss) From Continuing Operations Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
U.S. Federal	$ 608,981	$ 740,785	$ (234,860)
Foreign			(157)
Income (loss) from continuing operations before income taxes less net income attributable to the noncontrolling interests	$ 608,981	$ 740,785	$ (235,017)