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Stock-based Compensation - Summary of Restricted Stock Unit Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Unvested outstanding, beginning balance	2,973,002
Granted	1,811,208
Vested	(1,317,736)	(1,087,279)	(693,922)
Forfeited	(383,173)
Unvested outstanding, ending balance	3,083,301	2,973,002
Weighted-Average Grant Date Fair Value
Unvested outstanding, beginning balance	$ 26.06
Granted	39.07	$ 35.79	$ 16.99
Vested	23.93
Forfeited	31.70
Unvested outstanding, ending balance	$ 33.89	$ 26.06
Aggregate Intrinsic Value
Unvested outstanding, beginning balance	$ 100,279
Unvested outstanding, ending balance	$ 108,471	$ 100,279

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- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued 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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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