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Stock Plans - Summary of Performance Stock Unit Activity (Details) - Performance Stock Unit	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Shares
Unvested, beginning balance (in shares) | shares	200,212
Granted (in shares) | shares	52,309
Performance adjustments (in shares) | shares	5,357
Vested (in shares) | shares	(64,543)
Unvested, ending balance (in shares) | shares	193,335
Weighted Average Exercise Price (dollars per share)
Unvested, beginning balance (dollars per share) | $ / shares	$ 104.69
Granted (dollars per share) | $ / shares	175.59
Performance adjustments (dollars per share) | $ / shares	88.45
Vested (dollars per share) | $ / shares	85.41
Unvested, ending Balance (dollars per share) | $ / shares	$ 129.86

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- Definition

Share-based compensation arrangement by share-based payment award equity instruments other than options performance adjustment in period.

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Share-based compensation arrangement by share-based payment award equity instruments other than options performance adjustment in period, weighted average grant date fair value.

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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
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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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- 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.

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

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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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