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Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
Equity Plans (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units					$ 20,309	$ 32,327
Share-based compensation expenses			$ 8,683	$ 16,262	$ 16,812	$ 29,708
Total unrecognized share-based compensation costs, remaining period of recognition					2 years 2 months 12 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the company for tax withholding (in shares)			441		262,386
Total unrecognized share-based compensation costs	$ 35,300		$ 35,300		$ 35,300
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period (in shares)			1,270		616,091
New shares of company's class A common stock issued (in shares)			829		353,705
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
2011 Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	51,044
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)		628,508
Vesting period (in years)		3 years