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Stockholders' Equity - Share Activity (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
RSAs
Number of Shares
Beginning Balance (in shares) | shares	447,680
Granted (in shares) | shares	334,233
Vested (in shares) | shares	(166,115)
Forfeited (in shares) | shares	(26,439)
Ending Balance (in shares) | shares	589,359
Weighted Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 102.41
Granted (in dollars per share) | $ / shares	125.99
Vested (in dollars per share) | $ / shares	96.19
Forfeited (in dollars per share) | $ / shares	114.48
Ending Balance (in dollars per share) | $ / shares	$ 116.99
PSUs
Number of Shares
Beginning Balance (in shares) | shares	324,078
Granted (in shares) | shares	187,028
Vested (in shares) | shares	(7,368)
Forfeited (in shares) | shares	(29,271)
Ending Balance (in shares) | shares	474,467
Weighted Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 101.45
Granted (in dollars per share) | $ / shares	123.09
Vested (in dollars per share) | $ / shares	68.16
Forfeited (in dollars per share) | $ / shares	98.72
Ending Balance (in dollars per share) | $ / shares	$ 110.67

X

- 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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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).

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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.

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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
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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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