Stock-Based Compensation - Restricted and Performance Stock Units Rollforward (Details)	6 Months Ended
Jun. 30, 2021 $ / shares shares
Restricted Stock Units
Shares
Nonvested as of December 31, 2020 \| shares	51,276
Grants in period (in shares) \| shares	313,502
Nonvested as of June 30, 2021 \| shares	364,778
Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2020 \| $ / shares	$ 33.24
Granted (in dollars per share) \| $ / shares	34.45
Nonvested as of June 30, 2021 \| $ / shares	$ 34.28
Performance Shares
Shares
Nonvested as of December 31, 2020 \| shares	200,218
Grants in period (in shares) \| shares	50,868
Forfeited (in shares) \| shares	(3,375)
Nonvested as of June 30, 2021 \| shares	247,711
Weighted Average Grant-Date Fair Value
Nonvested as of December 31, 2020 \| $ / shares	$ 35.27
Granted (in dollars per share) \| $ / shares	34.97
Forfeited (in dollars per share) \| $ / shares	35.96
Nonvested as of June 30, 2021 \| $ / shares	$ 35.20

No definition available.

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- 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)
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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.

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-Publisher FASB
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-Topic 718
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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
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- Definition

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

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

+ References

No definition available.

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