Consolidated Statements of Convertible Redeemable Preferred Stock, Redeemable Noncontrolling Interest, Stockholders' Deficit and Noncontrolling Interest - USD ($) $ in Thousands		Total	Total Stockholders' Deficit	Common Stock		Additional Paid-In Capital	Accumulated Other Comprehensive Gain (Loss)	Accumulated Deficit	Redeemable Noncontrolling Interest	Noncontrolling Interest	Convertible Redeemable Preferred Stock	Series F preferred	Series G preferred	Class A common stock	Class A common stock Total Stockholders' Deficit	Class A common stock Common Stock		Class A common stock Additional Paid-In Capital	Class B common stock	Class B common stock Total Stockholders' Deficit	Class B common stock Common Stock		Class B common stock Additional Paid-In Capital
Stockholders' Equity Attributable to Parent			$ (1,686,784)	$ 1	[1]	$ 102,449	$ (844)	$ (1,788,390)
Beginning balance (in shares) at Dec. 31, 2015	[1]			9,938,603
Beginning balance at Dec. 31, 2015									$ 62,419	$ 70,708
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions from noncontrolling interests										209,860
Issuance of common stock warrant												$ 3,335
Issuance of common stock (in shares)				58,667	[1]							45,336	77,639
Issuance of Common Stock			1,816			1,816							$ 3,000
Issuance of restricted stock awards (in shares)	[1]			9,556
Issuance of restricted stock awards			280			280
Exercise of stock options (in shares)	[1]			125,394
Exercise of stock options			1,237			1,237
Stock-based compensation expense			27,865			27,865
Excess fair value of consideration paid over the noncontrolling interest reduction			(25,000)			(25,000)
Conversion of redeemable convertible preferred stock Series A-G		$ 0
Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital		0
Reclassification of derivative liability into additional paid-in capital		0
Excess fair value of consideration paid over the noncontrolling interest reduction		0
Change in effective portion of interest rate swap agreement		(418)	302				302		4	(724)
Distributions to noncontrolling interests			0						4,614	(46,007)
Net income (loss)		(336,316)							1,511	(58,169)
Net loss attributable to Class A and Class B common stockholders		(279,658)	(279,658)					(279,658)
Ending balance (in shares) at Dec. 31, 2016	[1]			10,132,220
Ending balance at Dec. 31, 2016									59,320	175,668
Beginning balance (in shares) at Dec. 31, 2015											71,617,187
Beginning balance at Dec. 31, 2015											$ 1,459,506
Ending balance (in shares) at Dec. 31, 2016											71,740,162
Ending balance at Dec. 31, 2016											$ 1,465,841
Stockholders' Equity Attributable to Parent			(1,959,942)	$ 1	[1]	108,647	(542)	(2,068,048)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contributions from noncontrolling interests										13,652
Issuance of common stock warrant			9,410			9,410
Issuance of common stock (in shares)	[1]			64,000
Issuance of Common Stock			1,981			1,981
Issuance of restricted stock awards (in shares)	[1]			33,896
Issuance of restricted stock awards			1,254			1,254
Exercise of stock options (in shares)	[1]			123,153
Exercise of stock options			432			432
Stock-based compensation expense			29,080			29,080
Conversion of redeemable convertible preferred stock Series A-G		0
Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital		0
Reclassification of derivative liability into additional paid-in capital		0
Excess fair value of consideration paid over the noncontrolling interest reduction		(13)	(13)				(13)
Change in effective portion of interest rate swap agreement		894	393				393		1	500
Distributions to noncontrolling interests									5,104	(11,845)
Net income (loss)		(281,265)							3,937	(22,603)
Net loss attributable to Class A and Class B common stockholders		$ (262,599)	(262,599)					(262,599)
Ending balance (in shares) at Dec. 31, 2017		10,353,269		10,353,269	[1]									0					0
Ending balance at Dec. 31, 2017									58,154	155,372
Ending balance (in shares) at Dec. 31, 2017		71,740,162									71,740,162
Ending balance at Dec. 31, 2017		$ 1,465,841									$ 1,465,841
Stockholders' Equity Attributable to Parent		$ (2,180,004)	(2,180,004)	$ 1	[1]	150,804	(162)	(2,330,647)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)	[1]			166,667																	5,734,440
Issuance of Common Stock			2,500	$ 0	[2]	2,500														$ 221,580	$ 1	[1]	$ 221,579
Issuance of restricted stock awards (in shares)	[1]			17,793
Issuance of restricted stock awards			349	$ 0	[2]	349
Exercise of stock options (in shares)	[1]			396,277
Exercise of stock options			1,521	$ 0	[2]	1,521
Stock-based compensation expense			177,646			177,646
Issuance of Class A common stock upon public offering, net (in shares)	[1]															20,700,000
Issuance of Class A common stock upon public offering, net															$ 282,276	$ 2	[1]	$ 282,274
Issuance of Class A and B common stock upon exercise of warrants (in shares)		312,575		312,575	[1]
Issuance of Class A and B common stock upon exercise of warrants	[2]			$ 0
Conversion of redeemable convertible preferred stock Series A-G	[1]			71,740,162
Conversion of redeemable convertible preferred stock Series A-G		$ 1,465,841	1,465,841	$ 7	[1]	1,465,834
Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital		882	882			882
Reclassification of derivative liability into additional paid-in capital		177,208	177,208			177,208
Excess fair value of consideration paid over the noncontrolling interest reduction		26	26				26
Change in effective portion of interest rate swap agreement		2,098	267				267		2	1,829
Distributions to noncontrolling interests			0						6,788	(8,462)
Net income (loss)		(259,489)							5,893	(23,629)
Net loss attributable to Class A and Class B common stockholders		$ (241,753)	(241,753)					(241,753)
Ending balance (in shares) at Dec. 31, 2018		0		109,421,183	[1]									20,868,286					88,552,897
Ending balance at Dec. 31, 2018									$ 57,261	$ 125,110
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity,Conversion of redeemable convertible preferred stock Series A-G (in shares)											(71,740,162)
Temporary Equity, Conversion of redeemable convertible preferred stock Series A-G											$ (1,465,841)
Ending balance (in shares) at Dec. 31, 2018		0									0	13,885,893	18,702,072						71,740,162
Ending balance at Dec. 31, 2018		$ 0									$ 0	$ 376,962	$ 722,142
Stockholders' Equity Attributable to Parent		$ (91,661)	$ (91,661)	$ 11	[1]	$ 2,480,597	$ 131	$ (2,572,400)

[1] Common Stock issued and converted to Class A Common and Class B Common effective July 2018.

[2] Amounts are less than $0.5 thousand and round down to zero