Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (886,401)	$ 102,430	$ 65,729	$ 48,977	$ 128,516	$ (90,510)	$ 28,128	$ 92,207	$ (669,265)	$ 158,341	$ 232,974
Less: Net (income) loss attributable to noncontrolling interest	(202)	(387)	(253)	(573)	(1,026)	(441)	(5,616)	(97)	(1,415)	(7,180)	(621)
Less: loss on redemption of subsidiary preferred stock									(1,688)
Less: (earnings) losses allocated to unvested shareholders									10,595	(1,277)
Adjusted income (loss) from continuing operations attributed to common shareholders									(661,773)	149,884	232,353
Income (loss) from discontinued operations, net of tax	$ (4,467)	$ 4,005	$ (1,032)	$ 1,515	$ 23,113	$ (14,430)	$ (26,873)	$ 7,011	$ 21	$ (11,179)	$ (67,526)
Earnings (losses) per share:
Basic from continuing operations (in dollars per share)	$ (3.06)	$ 0.34	$ 0.21	$ 0.16	$ 0.43	$ (0.30)	$ 0.08	$ 0.31	$ (2.28)	$ 0.51	$ 0.80
Basic from discontinued operations (in dollars per share)	$ (0.02)	$ 0.02		$ 0.01	$ 0.07	$ (0.05)	$ (0.09)	$ 0.03		$ (0.04)	$ (0.23)
Total Basic (in dollars per share)	$ (3.08)us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ (0.35)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ (2.28)us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic
Diluted from continuing operations (in dollars per share)	$ (3.06)	$ 0.34	$ 0.21	$ 0.16	$ 0.42	$ (0.30)	$ 0.08	$ 0.31	$ (2.28)	$ 0.51	$ 0.79
Diluted from discontinued operations (in dollars per share)	$ (0.02)	$ 0.01			$ 0.08	$ (0.05)	$ (0.09)	$ 0.02		$ (0.04)	$ (0.23)
Total Diluted (in dollars per share)	$ (3.08)us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ (0.35)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ (2.28)us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted
Shares (denominator):
Weighted-average number of shares outstanding - basic									290,694	294,182	289,965
Net effect of dilutive stock options, warrants and restricted stock awards based on the if-converted method (in shares)										2,410	2,358
Weighted Average Number of Shares Outstanding, Diluted, Total									290,694	296,592	292,323

Loss on redemption of subsidiary preferred stock.

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