Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (330,196)	$ (97,839)	$ (186,565)	$ (396,644)	$ (161,090)	$ (250,879)	$ (41,890)	$ 124,362	$ (1,011,244)	$ (329,497)	$ (669,265)
Less: net (income) loss attributable to noncontrolling interest	(1,125)	(1,185)	2,899	(724)	(834)	320	44	89	(135)	(381)	(1,415)
Less: loss on redemption of subsidiary preferred stock											(1,688)
Less: (earnings) losses allocated to unvested shareholders									22,730	7,820	10,595
Adjusted income (loss) from continuing operations, net of tax - basic									(988,649)	(322,058)	(661,773)
Income (loss) from discontinued operations, net of tax	$ (4,266)	$ (12,187)	$ (984)	$ (926)	$ (1,730)	$ (45,275)	$ 5,025	$ (817)	$ (18,363)	$ (42,797)	$ 21
Weighted-average number of shares outstanding - basic									276,475	282,982	290,694
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (1.17)	$ (0.35)	$ (0.65)	$ (1.41)	$ (0.57)	$ (0.86)	$ (0.14)	$ 0.43	$ (3.58)	$ (1.14)	$ (2.28)
Basic from discontinued operations (in dollars per share)	(0.01)	(0.04)			(0.01)	(0.16)	0.01		(0.06)	(0.15)
Total Basic (in dollars per share)	$ (1.18)	$ (0.39)	$ (0.65)	$ (1.41)	$ (0.58)	$ (1.02)	$ (0.13)	$ 0.43	$ (3.64)	$ (1.29)	$ (2.28)
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic									$ (988,649)	$ (322,058)	$ (661,773)
Adjusted income (loss) from continuing operations, net of tax - diluted									(988,649)	(322,058)	(661,773)
Income (loss) from discontinued operations, net of tax	$ (4,266)	$ (12,187)	$ (984)	$ (926)	$ (1,730)	$ (45,275)	$ 5,025	$ (817)	$ (18,363)	$ (42,797)	$ 21
Weighted-average number of shares outstanding - basic									276,475	282,982	290,694
Weighted-average number of shares outstanding - diluted									276,475	282,982	290,694
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share)	$ (1.17)	$ (0.35)	$ (0.65)	$ (1.41)	$ (0.57)	$ (0.86)	$ (0.14)	$ 0.43	$ (3.58)	$ (1.14)	$ (2.28)
Diluted from discontinued operations (in dollars per share)	(0.01)	(0.04)			(0.01)	(0.16)	0.01	(0.01)	(0.06)	(0.15)
Total Diluted (in dollars per share)	$ (1.18)	$ (0.39)	$ (0.65)	$ (1.41)	$ (0.58)	$ (1.02)	$ (0.13)	$ 0.42	$ (3.64)	$ (1.29)	$ (2.28)