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Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units						$ 34,648	$ 8,947
Share-based compensation expense				$ 9,455	$ 12,394	$ 39,163	$ 43,141
Total unrecognized share-based compensation costs, remaining period of recognition						1 year 9 months 18 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)						263,671
Total unrecognized share-based compensation costs	$ 39,100			$ 39,100		$ 39,100
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)						617,051
New shares of company's class A common stock issued (in shares)						353,380
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)						168,712
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)						368,296
New shares of company's class A common stock issued (in shares)						199,584
2011 Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)		29,916
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)			535,278
Vesting period (in years)			3 years
Chief Executive Officer \| 2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)	102,145,000
Vesting period (in years)	1 year
Share-based Compensation Award, Tranche One \| 2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)			178,764