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Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units		$ 20,292	$ 32,328
Share-based payment arrangement, expense		$ 8,129	$ 13,446
Total unrecognized share-based compensation costs, remaining period of recognition		2 years 4 months 24 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)		261,945
Total unrecognized share-based compensation costs	$ 41,800	$ 41,800
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)		614,821
New shares of company's class A common stock issued (in shares)		352,876
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)		155,103
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)		344,157
New shares of company's class A common stock issued (in shares)		189,054
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)	628,508
Vesting period (in years)	3 years