Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (396,644)	$ 124,362
Less: net (income) loss attributable to noncontrolling interest	(724)	89
Less: (earnings) losses allocated to unvested shareholders	8,199	(2,031)
Adjusted income (loss) from continuing operations, net of tax - basic	(389,169)	122,420
Income (loss) from discontinued operations, net of tax	$ (926)	$ (817)
Weighted-average number of shares outstanding - basic	275,851	285,361
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (1.41)	$ 0.43
Total Basic (in dollars per share)	$ (1.41)	$ 0.43
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic	$ (389,169)	$ 122,420
Add: effect of reallocating undistributed earnings of unvested shareholders		5
Adjusted income (loss) from continuing operations, net of tax - diluted	(389,169)	122,425
Income (loss) from discontinued operations, net of tax	$ (926)	$ (817)
Weighted-average number of shares outstanding - basic	275,851	285,361
Add: dilutive effect of potential common shares		812
Weighted-average number of shares outstanding - diluted	275,851	286,173
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share)	$ (1.41)	$ 0.43
Diluted from discontinued operations (in dollars per share)		(0.01)
Total Diluted (in dollars per share)	$ (1.41)	$ 0.42