Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash outflow to reacquire equity classified as other.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of share-based compensation awards.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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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, 2019	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deemed repurchases of restricted stock units		$ (22,959)	$ (15,354)
Share-based compensation expense		$ 19,899	$ 15,319
Total unrecognized share-based compensation costs, remaining period of recognition (in years)		2 years 6 months
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	$ 120,100	$ 120,100
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
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 \| RSUs \| Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in units)	165,194
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%