Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ 65,729	$ 28,128	$ 114,706	$ 120,335
Less: Net (income) loss attributable to noncontrolling interest	(253)	(5,616)	(826)	(5,713)
Less: loss on redemption of subsidiary preferred stock	(1,688)		(1,688)
Less: (earnings) losses allocated to unvested shareholders	(974)	(814)	(1,707)
Adjusted income (loss) from continuing operations - basic and diluted	62,814	21,698	110,485	114,622
Income (loss) from discontinued operations, net of tax	$ (1,032)	$ (26,873)	$ 483	$ (19,862)
Earnings (losses) per share:
Basic from continuing operations (in dollars per share)	$ 0.21	$ 0.08	$ 0.37	$ 0.41
Basic from discontinued operations (in dollars per share)		$ (0.09)		$ (0.09)
Total Basic (in dollars per share)	$ 0.21	$ (0.01)	$ 0.37	$ 0.32
Diluted from continuing operations (in dollars per share)	$ 0.21	$ 0.08	$ 0.37	$ 0.41
Diluted from discontinued operations (in dollars per share)		$ (0.09)		$ (0.09)
Total Diluted (in dollars per share)	$ 0.21	$ (0.01)	$ 0.37	$ 0.32
Shares (denominator):
Weighted-average number of shares outstanding - basic	297,984	294,747	297,097	293,217
Net effect of dilutive stock options, warrants and restricted stock awards based on the if-converted method (in shares)	2,997	2,372	2,919	2,427
Weighted-average number of shares outstanding - diluted	300,981	297,119	300,016	295,644