Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ 124,362	$ 48,977
Less: Net (income) loss attributable to noncontrolling interest	89	(573)
Less: (earnings) losses allocated to unvested shareholders	(2,031)	(733)
Adjusted income (loss) from continuing operations	122,420	47,671
Income (loss) from discontinued operations	(817)	1,515
Weighted-average number of shares outstanding - basic	285,361	296,210
Earnings (Losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ 0.43	$ 0.16
Basic from discontinued operations (in dollars per share)		$ 0.01
Total Basic (in dollars per share)	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.17us-gaap_EarningsPerShareBasic
DILUTED EPS:
Income (loss) from continuing operations attributed to common shareholders	122,420	47,671
Add: effect of reallocating undistributed earnings of unvested shareholders	5us-gaap_UndistributedEarningsDiluted
Adjusted income (loss) from continuing operations attributed to common shareholders	122,425	47,671
Income (loss) from discontinued operations	$ (817)	$ 1,515
Weighted-average number of shares outstanding - basic	285,361	296,210
Add: dilutive effect of potential common shares	812	2,840
Weighted-average number of diluted shares outstanding	286,173	299,050
Earnings (Losses) Per Share -Diluted
Diluted from continuing operations (in dollars per share)	$ 0.43	$ 0.16
Diluted from discontinued operations (in dollars per share)	$ (0.01)
Total Diluted (in dollars per share)	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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