Earnings (Loss) Per Share - Summary of Earnings (Loss) Per Share Basic and Diluted (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
Numerator used in basic and diluted earnings (loss) per common share for continuing operations:
Net income (loss)	$ (43,792)	$ (67,181)	$ (35,549)	$ (150,792)
Net loss attributable to noncontrolling interests	2,037	3,943	892	2,652
Loss from continuing operations	(41,755)	(63,238)	(34,657)	(148,140)
Gain upon conversion of Series A Preferred Stock			74,110	0
Subtotal: accretion of Series A Preferred Stock and other redeemable noncontrolling interests and equity	324	(84,060)	12,707	(192,141)
Net loss from continuing operations available to common stockholders for basic and diluted earnings per share	(41,431)	(147,298)	(21,950)	(340,281)
Adjusted for: accretion of Series A Preferred Stock			61,974	0
Adjusted for: gain upon conversion of Series A Preferred Stock			(74,110)	0
Net income (loss) available to common stockholders	(41,431)	(147,298)	(34,086)	(340,281)
Numerator used in basic and diluted earnings (loss) per common share for discontinued operations:
(Loss) income from discontinued operations, net of tax	(34,466)	(36,309)	22,459	44,047
Loss on sales of discontinued operations, net of tax	(18,426)	0	311,904	0
(Income) loss attributable to noncontrolling interests	(142)	1,588	(1,207)	(287)
Net income (loss) from discontinued operations for basic and diluted earnings per share, basic	(53,034)	(34,721)	333,156	43,760
Net income (loss) from discontinued operations for basic and diluted earnings per share, diluted	$ (53,034)	$ (34,721)	$ 333,156	$ 43,760
Denominator used in basic and diluted earnings (loss) per common share:
Basic weighted average shares outstanding (in shares)	224,037	178,871	209,129	167,261
Basic and diluted loss per share:
Loss from continuing operations (in USD per share)	$ (0.18)	$ (0.82)
Loss from discontinued operations (in USD per share)	(0.24)	(0.20)
Basic and diluted loss per share (in USD per share)	$ (0.42)	$ (1.02)
Basic earnings (loss) per share:
Income (loss) from continuing operations (in USD per share)			$ (0.10)	$ (2.03)
Income from discontinued operations (in USD per share)			1.59	0.26
Basic earnings (loss) per share (in USD per share)			1.49	(1.77)
Diluted earnings (loss) per share:
Loss from continuing operations (in USD per share)			(0.16)	(2.03)
Income from discontinued operations (in USD per share)			1.59	0.26
Diluted earnings per share (in USD per share)			$ 1.43	$ (1.77)
Redeemable noncontrolling interests and equity
Numerator used in basic and diluted earnings (loss) per common share for continuing operations:
Accretion of redemption value of redeemable noncontrolling interests and equity	$ 324	$ (105)	$ 1,130	$ (635)
Accretion of Series A Preferred Stock			1,130
Series A Convertible Redeemable Preferred Stock
Numerator used in basic and diluted earnings (loss) per common share for continuing operations:
Adjusted for: accretion related to noncontrolling interests and equity redeemable at fair value			(559)	(6,357)
Accretion of Series A Preferred Stock	$ 0	$ (83,955)	$ (61,974)	$ (185,149)