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Stock Based Compensation - Restricted Stock Unit Activity (Details) - Restricted stock units issued and outstanding	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of awards outstanding
Number of nonvested RSUs outstanding, beginning balance (in shares) | shares	450,614
Number of nonvested RSUs, granted (in shares) | shares	146,989
Number of nonvested RSUs, vested (in shares) | shares	(173,695)
Number of nonvested RSUs, forfeited or cancelled (in shares) | shares	(54,294)
Number of nonvested RSUs outstanding, ending balance (in shares) | shares	369,614
Weighted-average grant date fair value (per share)
Weighted-average grant date fair value, beginning balance (in usd per share) | $ / shares	$ 51.58
Weighted average grant-date fair value of nonvested RSUs, granted (in usd per share) | $ / shares	146.80
Weighted-average grant date fair value of nonvested RSUs, vested (in usd per share) | $ / shares	62.13
Weighted-average grant date fair value of nonvested restricted RSUs, forfeited or cancelled (in usd per share) | $ / shares	74.82
Weighted-average grant date fair value, ending balance (in usd per share) | $ / shares	$ 84.11

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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.

+ References

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- Definition

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).

+ References

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-Publisher FASB
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-Topic 718
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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).

+ References

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- Definition

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.

+ References

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- Definition

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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-Publisher FASB
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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

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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