Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ 82,204	$ (31,563)	$ 234,678	$ 55,927
Less: Net (income) loss attributable to noncontrolling interest	(708)	(453)	355	1,208
Adjusted income (loss) from continuing operations, net of tax - basic	81,496	(32,016)	235,033	57,135
Add: interest expense on assumed conversion of our 0.94% senior exchangeable notes due 2011, net of tax
Adjusted net income (loss) from continuing operations, net of tax - diluted	81,496	(32,016)	235,033	57,135
Earnings (losses) per share:
Basic from continuing operations	$ 0.28	$ (0.11)	$ 0.82	$ 0.21
Diluted from continuing operations	$ 0.28	$ (0.11)	$ 0.80	$ 0.19
Income (loss) from discontinued operations, net of tax	$ (7,240)	$ (7,591)	$ 114,496	$ (12,921)
Earnings (losses) per share:
Basic from discontinued operations	$ (0.02)	$ (0.03)	$ 0.40	$ (0.05)
Diluted from discontinued operations	$ (0.03)	$ (0.03)	$ 0.39	$ (0.04)
Shares (denominator):
Weighted-average number of shares outstanding - basic	287,487	285,282	286,971	285,045
Net effect of dilutive stock options, warrants and restricted stock awards based on the if-converted method	4,499		6,020	4,802
Assumed conversion of our 0.94% senior exchangeable notes due 2011
Weighted-average number of shares outstanding - diluted	291,986	285,282	292,991	289,847

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