CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Allowance and reserves	$ 29,787	$ 20,293
Treasury stock (shares)	15,123,000	7,326,000
Class A Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001	$ 0.001
Common stock authorized (shares)	2,000,000,000	2,000,000,000
Common stock issued (shares)	92,660,000	87,007,000
Common stock outstanding (shares)	77,537,000	79,681,000
Class B Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 0.001	0.001
Common stock authorized (shares)	1,500,000,000	1,500,000,000
Common stock issued (shares)	421,859,000	421,570,000
Common stock outstanding (shares)	421,859,000	421,570,000
Class C Common Stock
Common stock, par value (USD per share)	$ 0.001	$ 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