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Stockholders' Equity - Restricted and Performance Stock Activity (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
RSAs
RSAs and PSUs
Unvested balance, beginning of period (in shares) | shares	447,680
Granted (in shares) | shares	344,739
Vested (in shares) | shares	(172,675)
Forfeited (in shares) | shares	(34,660)
Unvested balance, shares end of period (in shares) | shares	585,084
Weighted Average Grant Date Fair Value
Unvested balance, beginning balance (USD per share) | $ / shares	$ 102.41
Granted (USD per share) | $ / shares	127.89
Vested (USD per share) | $ / shares	98.05
Forfeited (USD per share) | $ / shares	113.10
Unvested balance, ending balance (USD per share) | $ / shares	$ 118.07
PSUs
RSAs and PSUs
Unvested balance, beginning of period (in shares) | shares	324,078
Granted (in shares) | shares	188,522
Vested (in shares) | shares	(7,368)
Forfeited (in shares) | shares	(33,323)
Unvested balance, shares end of period (in shares) | shares	471,909
Weighted Average Grant Date Fair Value
Unvested balance, beginning balance (USD per share) | $ / shares	$ 101.45
Granted (USD per share) | $ / shares	123.61
Vested (USD per share) | $ / shares	68.16
Forfeited (USD per share) | $ / shares	98.34
Unvested balance, ending balance (USD per share) | $ / shares	$ 111.04

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.

+ References

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-Publisher FASB
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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).

+ 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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-Publisher FASB
-Name Accounting Standards Codification
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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

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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.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
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-Paragraph 2
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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
-SubTopic 10
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-Paragraph 2
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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.

+ References

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