Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ 48,977	$ 92,207
Less: Net (income) loss attributable to noncontrolling interest	(573)	(97)
Less: (earnings) losses allocated to unvested shareholders	(733)	(814)
Adjusted income (loss) from continuing operations - basic and diluted	47,671	91,296
Income (loss) from discontinued operations, net of tax	$ 1,515	$ 7,011
Earnings (losses) per share:
Basic from continuing operations (in dollars per share)	$ 0.16	$ 0.31
Basic from discontinued operations (in dollars per share)	$ 0.01	$ 0.03
Total Basic (in dollars per share)	$ 0.17	$ 0.34
Diluted from continuing operations (in dollars per share)	$ 0.16	$ 0.31
Diluted from discontinued operations (in dollars per share)		$ 0.02
Total Diluted (in dollars per share)	$ 0.16	$ 0.33
Shares (denominator):
Weighted-average number of shares outstanding - basic	296,210	291,687
Net effect of dilutive stock options, warrants and restricted stock awards based on the if-converted method (in shares)	2,840	2,483
Weighted-average number of shares outstanding - diluted	299,050	294,170