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Stock-Based Compensation - Schedule of Performance Based Restricted Stock Units (Details) - Performance Based Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Units
Unvested at beginning of period (in shares)	449
Granted (in shares)	343
Forfeited (in shares)	(21)
Vested, including shares withheld for tax (in shares)	(203)
Performance adjustment (in shares)	14
Unvested at end of period (in shares)	582
Restricted shares withheld for tax (in shares)	52
Weighted-Average Grant-Date Fair Value
Unvested at beginning of period (in dollars per share) | $ / shares	$ 140.58
Granted (in dollars per share) | $ / shares	170.71
Forfeited (in dollars per share) | $ / shares	150.40
Vested (in dollars per share) | $ / shares	107.77
Performance adjustment (in dollars per share) | $ / shares	81.21
Unvested at end of period (in dollars per share) | $ / shares	$ 170.05

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
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-Section 50
-Paragraph 2
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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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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).

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

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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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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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