Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Total	Common stock	Preferred Stock	Additional paid-in capital	Retained earnings (deficit)	Treasury stock	Parent	Noncontrolling Interest	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member] Common stock	Convertible Preferred Stock [Member] Preferred Stock	Convertible Preferred Stock [Member] Additional paid-in capital	Convertible Preferred Stock [Member] Parent
Beginning Balance at Dec. 31, 2014	$ 866,541,000	$ 734,000	$ 0	$ 724,819,000	$ 140,855,000	$ 0	$ 866,408,000	$ 133,000
Beginning Balance, shares (in shares) at Dec. 31, 2014		73,374,000	0			31,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	260,252,000	$ 104,000		260,148,000			260,252,000		$ 32,490,000		$ 1,000	$ 32,489,000	$ 32,490,000
Issuance of Class A common stock, shares		10,329,000									150,000
Conversion of Class B common stock to Class A common stock, shares		(1,500,000)	150,000
Stock Issued During Period, Value, Conversion of Convertible Securities	0	$ (15,000)	$ 1,000	14,000			0
Stock options expense related to equity based awards	9,333,000			9,333,000			9,333,000
Stock options exercised, shares		25,000
Stock options exercised	10,000			10,000			10,000
Liability-based stock option awards settled, shares		25,000
Liability-based stock option awards settled	446,000			446,000			446,000
Restricted stock issued	0	$ (4,000)		(4,000)			0
Restricted stock issued, shares		429,000
Cost to issue equity	(1,151,000)	$ 0		(1,151,000)			(1,151,000)
Restricted stock forfeited, Shares						138,000
Restricted stock forfeited	0			0			0
Contributions from non-controlling interest owners of less-than-wholly-owned subsidiaries	562,000							562,000
Vesting of restricted stock units		52,000
Restricted stock and restricted stock units expense	0	$ 1,000		(1,000)			0
Cancellation of treasury stock (shares)		(167,000)				(167,000)
Cancellation of treasury stock	0	$ (2,000)		2,000		$ 0	0
Current period net income	(679,785,000)
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiaries	0
Class B dividends declared					0
Net (loss) income	(679,524,000)				(679,785,000)		(679,785,000)	261,000
Ending Balance, shares (in shares) at Dec. 31, 2015		85,567,000	0			2,000
Ending Balance at Dec. 31, 2015	488,959,000	$ 856,000	$ 0	1,026,077,000	(538,930,000)	$ 0	488,003,000	956,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	288,510,000	$ 135,000		288,375,000			288,510,000		0	$ 4,000	$ 0	(4,000)	0
Issuance of Class A common stock, shares		13,500,000								471,000	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		$ 1,000							0			(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	10,000			10,000			10,000
Liability-based stock option awards settled, shares		10,000
Liability-based stock option awards settled	255,000			255,000			255,000
Cost to issue equity	(1,190,000)			(1,190,000)			(1,190,000)
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
Current period net income	(97,421,000)
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiaries	0
Net (loss) income	$ (97,057,000)				(97,421,000)		(97,421,000)	364,000
Ending Balance, shares (in shares) at Dec. 31, 2016	99,511,931	99,519,000	0			6,000
Ending Balance at Dec. 31, 2016	$ 691,445,000	$ 995,000	$ 0	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	208,720,000	$ 80,000		208,640,000			208,720,000		0	$ 5,000		(5,000)	0
Issuance of Class A common stock, shares		8,000,000								530,000
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		$ 1,000							$ 0			$ (1,000)	$ 0
Stock options expense related to equity based awards	$ 19,594,000			19,594,000			19,594,000
Stock options exercised, shares	833,000	514,000
Stock options exercised	$ (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
Current period net income	125,867,000
Capital contribution from non-controlling interest owners in less-than-wholly-owned subsidiaries	44,100,000
Net (loss) income	$ 138,007,000						125,867,000	12,140,000
Ending Balance, shares (in shares) at Dec. 31, 2017	108,510,160	108,514,000	0			3,000
Ending Balance at Dec. 31, 2017	$ 1,257,546,000	$ 1,085,000	$ 0	$ 1,666,024,000	$ (510,484,000)	$ (69,000)	$ 1,156,556,000	$ 100,990,000