Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (186,565)	$ (41,890)	$ (583,209)	$ 82,472
Less: net (income) loss attributable to noncontrolling interest	2,899	44	2,175	133
Less: (earnings) losses allocated to unvested shareholders	3,786	720	11,985	(1,311)
Adjusted income (loss) from continuing operations, net of tax - basic	(179,880)	(41,126)	(569,049)	81,294
Income (loss) from discontinued operations, net of tax	$ (984)	$ 5,025	$ (1,910)	$ 4,208
Weighted-average number of shares outstanding - basic	276,550	286,085	276,201	285,723
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (0.65)	$ (0.14)	$ (2.06)	$ 0.28
Basic from discontinued operations (in dollars per share)		0.01	(0.01)	0.02
Total Basic (in dollars per share)	$ (0.65)	$ (0.13)	$ (2.07)	$ 0.30
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic	$ (179,880)	$ (41,126)	$ (569,049)	$ 81,294
Add: effect of reallocating undistributed earnings of unvested shareholders				5
Adjusted income (loss) from continuing operations, net of tax - diluted	(179,880)	(41,126)	(569,049)	81,299
Income (loss) from discontinued operations, net of tax	$ (984)	$ 5,025	$ (1,910)	$ 4,208
Weighted-average number of shares outstanding - basic	276,550	286,085	276,201	285,723
Add: dilutive effect of potential common shares				978
Weighted-average number of shares outstanding - diluted	276,550	286,085	276,201	286,701
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share)	$ (0.65)	$ (0.14)	$ (2.06)	$ 0.28
Diluted from discontinued operations (in dollars per share)		0.01	(0.01)	0.02
Total Diluted (in dollars per share)	$ (0.65)	$ (0.13)	$ (2.07)	$ 0.30