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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, 2021	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units		$ 34,633	$ 8,858
Share-based compensation expense		$ 13,446	$ 15,512
Total unrecognized share-based compensation costs, remaining period of recognition		2 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the Company for tax withholding		263,671
Total unrecognized share-based compensation costs	$ 58,800	$ 58,800
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period		617,051
New shares of Company's Class A common stock issued		353,380
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the Company for tax withholding		168,712
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period		368,296
New shares of Company's Class A common stock issued		199,584
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
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