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Stock Incentive Plans - Summary of Non-vested Restricted Stock Units ("RSUs") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares Underlying RSUs
Options Granted (in shares)	0
RSUs issued and unvested
Shares Underlying RSUs
Beginning balance (in shares)	886,030	547,891
Options Granted (in shares)	595,915	629,901
Vested (in shares)	(235,915)	(180,842)
Forfeited (in shares)	(131,871)	(110,920)
Ending balance (in shares)	1,114,159	886,030	547,891
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 77.92	$ 56.62
Granted (in USD per share)	104.09	87.72
Vested (in USD per share)	69.01	52.52
Forfeited (in USD per share)	59.85	69.77
Ending balance (in USD per share)	$ 94.25	$ 77.92	$ 56.62
Weighted Remaining Vesting Period (in years)
Weighted remaining vesting period of RSUs (in years)	1 year 4 months 17 days	1 year 4 months 20 days	2 years 5 months 12 days
Aggregate Intrinsic Value (in thousands)
Aggregate intrinsic value of RSUs	$ 264,290	$ 60,330	$ 38,067

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Weighted Remaining Vesting Period (in years)

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

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-Publisher FASB
-Name Accounting Standards Codification
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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 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 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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

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