Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Total	Common stock	Additional paid-in capital	Accumulated deficit	Treasury stock	Parent	Noncontrolling Interest
Beginning Balance at Dec. 31, 2015	$ 488,959,000	$ 856,000	$ 1,026,077,000	$ (538,930,000)	$ 0	$ 488,003,000	$ 956,000
Beginning Balance, shares (in shares) at Dec. 31, 2015		85,567,000			2,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock, shares		13,500,000
Issuance of Class A common stock	288,510,000	$ 135,000	288,375,000			288,510,000
Issuance of common stock pursuant to employee stock compensation plan, shares		471,000
Issuance of common stock pursuant to employee stock compensation plan	0	$ 4,000	(4,000)			0
Issuance of Class A common stock to Board member and advisors, shares		51,000
Issuance of Class A common stock to Board member and advisors	0	$ 1,000	(1,000)			0
Stock options expense related to equity based awards	11,958,000		11,958,000			11,958,000
Stock options exercised, shares		36,000
Stock options exercised, net of options forfeited in net share settlements	10,000		10,000			10,000
Cost to issue equity	(1,190,000)		(1,190,000)			(1,190,000)
Liability-based stock option awards settled, shares		10,000
Liability-based stock option awards settled	255,000		255,000			255,000
Restricted stock forfeited, shares					120,000
Restricted stock forfeited	0		0			0
Cancellation of treasury stock, shares		(116,000)			(116,000)
Cancellation of treasury stock	0	$ (1,000)	1,000		$ 0	0
Net (loss) income	(97,057,000)			(97,421,000)		(97,421,000)	364,000
Ending Balance, shares (in shares) at Dec. 31, 2016		99,519,000			6,000
Ending Balance at Dec. 31, 2016	691,445,000	$ 995,000	1,325,481,000	(636,351,000)	$ 0	690,125,000	1,320,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock, shares		8,000,000
Issuance of Class A common stock	208,720,000	$ 80,000	208,640,000			208,720,000
Issuance of common stock pursuant to employee stock compensation plan, shares		530,000
Issuance of common stock pursuant to employee stock compensation plan	0	$ 5,000	(5,000)			0
Issuance of Class A common stock to Board member and advisors, shares		77,000
Issuance of Class A common stock to Board member and advisors	0	$ 1,000	(1,000)			0
Stock options expense related to equity based awards	19,594,000		19,594,000			19,594,000
Stock options exercised, shares		514,000
Stock options exercised, net of options forfeited in net share settlements	(1,184,000)	$ 5,000	(1,189,000)			(1,184,000)
Cost to issue equity	(280,000)		(280,000)			(280,000)
Restricted stock forfeited, shares					123,000
Restricted stock forfeited	(1,658,000)				$ (1,658,000)	(1,658,000)
Purchase of non-controlling interest of less-than-wholly-owned subsidiary	(2,653,000)		(1,250,000)			(1,250,000)	(1,403,000)
Contributions related to formation of Joint Venture (see Note 5)	171,500,000		116,622,000			116,622,000	54,878,000
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	44,100,000						44,100,000
Distributions to non-controlling interest owners of less-than wholly-owned subsidiaries	(10,045,000)						(10,045,000)
Cancellation of treasury stock, shares		(126,000)			(126,000)
Cancellation of treasury stock	0	$ (1,000)	(1,588,000)		$ (1,589,000)	0
Net (loss) income	$ 138,007,000			125,867,000		125,867,000	12,140,000
Ending Balance, shares (in shares) at Dec. 31, 2017	108,510,160	108,514,000			3,000
Ending Balance at Dec. 31, 2017	$ 1,257,546,000	$ 1,085,000	1,666,024,000	(510,484,000)	$ (69,000)	1,156,556,000	100,990,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock, shares		7,000,000
Issuance of Class A common stock	226,612,000	$ 70,000	226,542,000			226,612,000
Issuance of common stock pursuant to employee stock compensation plan, shares		759,000
Issuance of common stock pursuant to employee stock compensation plan	0	$ 8,000	(8,000)			0
Issuance of Class A common stock to Board member and advisors, shares		81,000
Issuance of Class A common stock to Board member and advisors	0	$ 1,000	(1,000)			0
Stock options expense related to equity based awards	$ 22,660,000		22,660,000			22,660,000
Stock options exercised, shares	383,000	179,000
Stock options exercised, net of options forfeited in net share settlements	$ (1,267,000)	$ 2,000	(1,269,000)			(1,267,000)
Cost to issue equity	(204,000)		(204,000)			(204,000)
Restricted stock forfeited, shares					176,000
Restricted stock forfeited	(4,384,000)				$ (4,384,000)	(4,384,000)
Contributions related to formation of Joint Venture (see Note 5)	14,700,000		14,700,000			14,700,000	0
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	85,750,000						85,750,000
Distributions to non-controlling interest owners of less-than wholly-owned subsidiaries	(121,520,000)						(121,520,000)
Cancellation of treasury stock, shares		158,000			158,000
Cancellation of treasury stock	0	$ (2,000)	(4,036,000)		$ 4,038,000	0
Net (loss) income	$ 299,764,000			274,207,000		274,207,000	25,557,000
Ending Balance, shares (in shares) at Dec. 31, 2018	116,353,590	116,375,000			21,000
Ending Balance at Dec. 31, 2018	$ 1,779,657,000	$ 1,164,000	$ 1,924,408,000	$ (236,277,000)	$ (415,000)	$ 1,688,880,000	$ 90,777,000