Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss attributable to Class A and Class B stockholders	$ (62,216)	$ (45,677)	$ (146,657)	$ (63,393)
Other comprehensive income (loss), net of taxes:
Unrealized gain (loss) on available-for-sale securities	9	100	26	91
Change in derivative instruments designated and qualifying in cash flow hedges	(3,502)	986	(5,693)	3,853
Other comprehensive income (loss), net of taxes	(3,493)	1,086	(5,667)	3,944
Comprehensive loss	(65,709)	(44,591)	(152,324)	(59,449)
Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests	3,340	(984)	5,388	(3,563)
Comprehensive loss attributable to Class A and Class B stockholders	$ (62,369)	$ (45,575)	$ (146,936)	$ (63,012)