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Stock-Based Compensation - Restricted Stock Activity (Details) - 2011 Management Incentive Plan [Member] - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Oct. 31, 2020
Share-based Compensation
Outstanding, Number of Shares, Beginning Balance		69
Vested, Number of Shares		(51)
Forfeited, Number of Shares	(14)
Granted, Number of Shares		72
Outstanding, Number of Shares, Ending Balance		76
Outstanding, Weighted-Average Exercise Price, balance balance		$ 71.74
Vested, Weighted-Average Grant Price		70.48
Forfeited, Weighted-Average Grant Price	$ 84.54
Granted, Weighted-Average Grant Price		81.19
Outstanding, Weighted-Average Exercise Price, ending balance		$ 80.45
Aggregate Intrinsic Value		$ 5,107

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).

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

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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