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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	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units					$ 23,019	$ 15,734
Share-based compensation expense			$ 13,841	$ 16,934	$ 50,465	$ 52,006
Total unrecognized share-based compensation costs, remaining period of recognition					2 years 1 month 6 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the Company for tax withholding					217,265
Total unrecognized share-based compensation costs			$ 85,300		$ 85,300
RSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period					518,583
New shares of Company's Class A common stock issued					301,318
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares surrendered to the Company for tax withholding					150,771
PRSUs \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested in period					349,761
New shares of Company's Class A common stock issued					198,990
2011 Stock Plan for Non-Employee Directors \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)	34,678
2016 Employee Stock Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)		498,320
Vesting period (in years)					3 years
2016 Employee Stock Plan \| PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)		390,566
Vesting period (in years)					3 years
2016 Employee Stock Plan \| PRSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period (as a percentage)					0.00%
2016 Employee Stock Plan \| PRSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period (as a percentage)					200.00%
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)		165,194