Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 31, 2017
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (93,710)	$ (119,285)	$ (432,512)	$ (382,389)
Less: net (income) loss attributable to noncontrolling interest	(6,934)	(2,113)	(10,426)	(5,001)
Less: preferred stock dividends	(4,313)		(7,993)
Less: accrued distribution on redeemable noncontrolling interest in subsidiary	(2,146)		(6,668)
Less: (earnings) losses allocated to unvested shareholders	(432)	3,463	(1,375)	10,580
Adjusted income (loss) from continuing operations, net of tax - basic	(107,535)	(117,935)	(458,974)	(376,810)
Income (loss) from discontinued operations, net of tax	$ (13,933)	$ (27,134)	$ (14,592)	$ (43,077)
Weighted-average number of shares outstanding - basic	350,194	279,313	329,118	278,670
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (0.31)	$ (0.42)	$ (1.39)	$ (1.35)
Basic from discontinued operations (in dollars per share)	(0.04)	(0.10)	(0.05)	(0.16)
Total Basic (in dollars per share)	$ (0.35)	$ (0.52)	$ (1.44)	$ (1.51)
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic	$ (107,535)	$ (117,935)	$ (458,974)	$ (376,810)
Adjusted income (loss) from continuing operations, net of tax - diluted	(107,535)	(117,935)	(458,974)	(376,810)
Income (loss) from discontinued operations, net of tax	$ (13,933)	$ (27,134)	$ (14,592)	$ (43,077)
Weighted-average number of shares outstanding - basic	350,194	279,313	329,118	278,670
Weighted-average number of shares outstanding - diluted	350,194	279,313	329,118	278,670
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share)	$ (0.31)	$ (0.42)	$ (1.39)	$ (1.35)
Diluted from discontinued operations (in dollars per share)	(0.04)	(0.10)	(0.05)	(0.16)
Total Diluted (in dollars per share)	$ (0.35)	$ (0.52)	$ (1.44)	$ (1.51)
0.75% senior exchangeable notes due January 2024
Earnings (losses) per share:
Aggregate amount of senior notes	$ 575,000		$ 575,000		$ 575,000
Interest rate on senior notes due (as a percent)	0.75%		0.75%
0.75% senior exchangeable notes due January 2024 | Minimum
Earnings (losses) per share:
Share issued price (in dollars per share)	$ 25.16		$ 25.16