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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, 2020	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units		$ 8,858	$ 22,959
Share-based compensation expense		$ 15,512	$ 19,899
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		197,824
Total unrecognized share-based compensation costs	$ 71,200	$ 71,200
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period		475,114
New shares of Company's Class A common stock issued		277,290
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the Company for tax withholding		142,882
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period		325,836
New shares of Company's Class A common stock issued		182,954
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)	1,171,956
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)	380,142