CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts receivable allowance	$ 21,507	$ 16,603
Property and equipment accumulated depreciation and amortization	57,502	36,473
Accumulated amortization of intangible assets	$ 127,792	$ 85,589
Class A Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	2,000,000,000	2,000,000,000
Common stock issued (shares)	86,075,000	80,515,000
Common stock outstanding (shares)	81,922,000	80,515,000
Class B Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	1,500,000,000	1,500,000,000
Common stock issued (shares)	421,570,000	421,118,000
Common stock outstanding (shares)	421,570,000	421,118,000
Class C Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock authorized (shares)	1,500,000,000	1,500,000,000
Common stock issued (shares)	0	0
Common stock outstanding (shares)	0	0