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Stock-Based Compensation - Restricted Stock Activity and Incentive Stock Awards Activity (Details)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 73.80
Granted (in dollars per share) | $ / shares	81.21
Vested (in dollars per share) | $ / shares	73.17
Canceled (in dollars per share) | $ / shares	75.56
Outstanding, end of period (in dollars per share) | $ / shares	$ 77.00
Restricted Stock and Units
Number of Shares
Outstanding, beginning of period (in shares)	656,006
Granted (in shares)	184,646
Vested (in shares)	(260,675)
Canceled (in shares)	(15,661)
Outstanding, end of period (in shares)	564,316
Incentive Stock Units
Number of Shares
Outstanding, beginning of period (in shares)	270,645
Granted (in shares)	241,467
Vested (in shares)	(37,672)
Canceled (in shares)	(7,498)
Outstanding, end of period (in shares)	466,942

X

- Definition

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

+ References

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.

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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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- 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).

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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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-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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-Publisher FASB
-Name Accounting Standards Codification
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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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