Stock-Based Compensation - Restricted Stock Activity (Details)	9 Months Ended
Sep. 30, 2021 $ / shares shares
Restricted Stock
Restricted Stock
Beginning of period (in shares) \| shares	254,331
Granted (in shares) \| shares	133,225
Released (in shares) \| shares	(51,319)
Forfeited (in shares) \| shares	(49,469)
End of period (in shares) \| shares	286,768
Weighted Average Grant Date Fair Value
Beginning balance (USD per share) \| $ / shares	$ 76.50
Granted (USD per share) \| $ / shares	83.41
Released (USD per share) \| $ / shares	66.68
Forfeited (USD per share) \| $ / shares	82.16
Ending balance (USD per share) \| $ / shares	$ 80.49
Stock-Settled Restricted Stock Units
Restricted Stock
Beginning of period (in shares) \| shares	355,570
Granted (in shares) \| shares	68,998
Released (in shares) \| shares	(317,702)
Forfeited (in shares) \| shares	0
End of period (in shares) \| shares	106,866
Weighted Average Grant Date Fair Value
Beginning balance (USD per share) \| $ / shares	$ 28.01
Granted (USD per share) \| $ / shares	63.04
Released (USD per share) \| $ / shares	22.95
Forfeited (USD per share) \| $ / shares	0
Ending balance (USD per share) \| $ / shares	$ 65.67

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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
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-Paragraph 2
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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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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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No definition available.

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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.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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-Publisher FASB
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