Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (41,890)	$ 65,729	$ 82,472	$ 114,706
Less: Net (income) loss attributable to noncontrolling interest	44	(253)	133	(826)
Less: loss on redemption of subsidiary preferred stock		(1,688)		(1,688)
Less: (earnings) losses allocated to unvested shareholders	720	(974)	(1,311)	(1,707)
Adjusted income (loss) from continuing operations	(41,126)	62,814	81,294	110,485
Income (loss) from discontinued operations	$ 5,025	$ (1,032)	$ 4,208	$ 483
Weighted-average number of shares outstanding - basic	286,085	297,984	285,723	297,097
Earnings (Losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (0.14)	$ 0.21	$ 0.28	$ 0.37
Basic from discontinued operations (in dollars per share)	0.01		0.02
Total Basic (in dollars per share)	$ (0.13)	$ 0.21	$ 0.30	$ 0.37
DILUTED EPS:
Income (loss) from continuing operations attributed to common shareholders	$ (41,126)	$ 62,814	$ 81,294	$ 110,485
Add: effect of reallocating undistributed earnings of unvested shareholders			5
Adjusted income (loss) from continuing operations attributed to common shareholders	(41,126)	62,814	81,299	110,485
Income (loss) from discontinued operations	$ 5,025	$ (1,032)	$ 4,208	$ 483
Weighted-average number of shares outstanding - basic	286,085	297,984	285,723	297,097
Add: dilutive effect of potential common shares		2,997	978	2,919
Weighted-average number of diluted shares outstanding	286,085	300,981	286,701	300,016
Earnings (Losses) Per Share -Diluted
Diluted from continuing operations (in dollars per share)	$ (0.14)	$ 0.21	$ 0.28	$ 0.37
Diluted from discontinued operations (in dollars per share)	0.01		0.02
Total Diluted (in dollars per share)	$ (0.13)	$ 0.21	$ 0.30	$ 0.37