Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (250,879)	$ 102,430	$ (168,407)	$ 217,136
Less: Net (income) loss attributable to noncontrolling interest	320	(387)	453	(1,213)
Less: loss on redemption of subsidiary preferred stock				(1,688)
Less: (earnings) losses allocated to unvested shareholders	5,834	(1,579)	4,523	(3,286)
Adjusted income (loss) from continuing operations	(244,725)	100,464	(163,431)	210,949
Income (loss) from discontinued operations	$ (45,275)	$ 4,005	$ (41,067)	$ 4,488
Weighted-average number of shares outstanding - basic	284,112	292,621	285,186	292,613
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (0.86)	$ 0.34	$ (0.57)	$ 0.72
Basic from discontinued operations (in dollars per share)	(0.16)	0.02	(0.15)	0.02
Total Basic (in dollars per share)	$ (1.02)	$ 0.36	$ (0.72)	$ 0.74
DILUTED EPS:
Income (loss) from continuing operations attributed to common shareholders	$ (244,725)	$ 100,464	$ (163,431)	$ 210,949
Add: effect of reallocating undistributed earnings of unvested shareholders		11		25
Adjusted income (loss) from continuing operations attributed to common shareholders	(244,725)	100,475	(163,431)	210,974
Income (loss) from discontinued operations	$ (45,275)	$ 4,005	$ (41,067)	$ 4,488
Weighted-average number of shares outstanding - basic	284,112	292,621	285,186	292,613
Add: dilutive effect of potential common shares		2,384		2,740
Weighted-average number of diluted shares outstanding	284,112	295,005	285,186	295,353
Earnings (Losses) Per Share -Diluted
Diluted from continuing operations (in dollars per share)	$ (0.86)	$ 0.34	$ (0.57)	$ 0.71
Diluted from discontinued operations (in dollars per share)	(0.16)	0.01	(0.15)	0.02
Total Diluted (in dollars per share)	$ (1.02)	$ 0.35	$ (0.72)	$ 0.73