Earnings (Losses) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 31, 2017
Net income (loss) (numerator):
Income (loss) from continuing operations, net of tax	$ (143,587)	$ (147,628)
Less: net (income) loss attributable to noncontrolling interest	(539)	(917)
Less: distribution of redeemable noncontrolling interest in subsidiary	(2,398)
Less: (earnings) losses allocated to unvested shareholders	3,360	3,811
Adjusted income (loss) from continuing operations, net of tax - basic	(143,164)	(144,734)
Income (loss) from discontinued operations, net of tax	$ (75)	$ (439)
Weighted-average number of shares outstanding - basic	308,788	277,781
Earnings (losses) Per Share - Basic
Basic from continuing operations (in dollars per share)	$ (0.46)	$ (0.52)
Total Basic (in dollars per share)	$ (0.46)	$ (0.52)
DILUTED EPS:
Adjusted income (loss) from continuing operations, net of tax - basic	$ (143,164)	$ (144,734)
Adjusted income (loss) from continuing operations, net of tax - diluted	(143,164)	(144,734)
Income (loss) from discontinued operations, net of tax	$ (75)	$ (439)
Weighted-average number of shares outstanding - basic	308,788	277,781
Weighted-average number of shares outstanding - diluted	308,788	277,781
Earnings (losses) per share:
Diluted from continuing operations (in dollars per share)	$ (0.46)	$ (0.52)
Total Diluted (in dollars per share)	$ (0.46)	$ (0.52)
0.75% senior exchangeable notes due January 2024
Earnings (losses) per share:
Aggregate amount of senior notes	$ 575,000		$ 575,000
Interest rate on senior notes due (as a percent)	0.75%
0.75% senior exchangeable notes due January 2024 | Minimum
Earnings (losses) per share:
Share issued price (in dollars per share)	$ 25.16