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Stock-Based Compensation - Restricted Stock Units Activity (Details) - RSUs and PSUs shares in Thousands	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Shares
Unvested, beginning balance (in shares) | shares	483
Granted (in shares) | shares	194
Vested (in shares) | shares	(158)
Forfeited (in shares) | shares	(21)
Unvested, ending balance (in shares) | shares	498
Weighted Average Grant Date Fair Value per Share
Unvested, beginning balance (in dollars per share) | $ / shares	$ 80.20
Granted (in dollars per share) | $ / shares	140.30
Vested (in dollars per share) | $ / shares	60.18
Forfeited (in dollars per share) | $ / shares	105.98
Unvested, ending balance (in dollars per share) | $ / shares	$ 108.77

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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- 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).

+ References

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-Publisher FASB
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-Paragraph 2
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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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- 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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- Definition

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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