Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ 102,430	$ (90,510)	$ 217,136	$ 29,825
Less: Net (income) loss attributable to noncontrolling interest	(387)	(441)	(1,213)	(6,154)
Less: loss on redemption of subsidiary preferred stock			1,688
Less: (earnings) losses allocated to unvested shareholders	(1,579)	1,411	(3,286)	671
Adjusted income (loss) from continuing operations	100,464	(89,540)	210,949	24,342
Income (loss) from discontinued operations	4,005	(14,430)	4,488	(34,292)
Weighted-average number of shares outstanding - basic	292,621	295,076	292,613	293,837
Earnings (Losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ 0.34	$ (0.30)	$ 0.72	$ 0.08
Basic from discontinued operations (in dollars per share)	$ 0.02	$ (0.05)	$ 0.02	$ (0.11)
Total Basic (in dollars per share)	$ 0.36	$ (0.35)	$ 0.74	$ (0.03)
DILUTED EPS:
Income (loss) from continuing operations attributed to common shareholders	100,464	(89,540)	210,949	24,342
Add: effect of reallocating undistributed earnings of unvested shareholders	11		25
Adjusted income (loss) from continuing operations attributed to common shareholders	100,475	(89,540)	210,974	24,342
Income (loss) from discontinued operations	$ 4,005	$ (14,430)	$ 4,488	$ (34,292)
Weighted-average number of shares outstanding - basic	292,621	295,076	292,613	293,837
Add: dilutive effect of potential common shares	2,384		2,740	2,371
Weighted-average number of shares outstanding - diluted	295,005	295,076	295,353	296,208
Earnings (Losses) Per Share -Diluted
Diluted from continuing operations (in dollars per share)	$ 0.34	$ (0.30)	$ 0.71	$ 0.08
Diluted from discontinued operations (in dollars per share)	$ 0.01	$ (0.05)	$ 0.02	$ (0.11)
Total Diluted (in dollars per share)	$ 0.35	$ (0.35)	$ 0.73	$ (0.03)