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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	192,624
Number of Shares, Granted	116,024
Number of Shares, Vested	(78,455)
Number of Shares, Forfeited	(3,209)
Number of Shares, Unvested, December 31, 2019	226,984	192,624
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 160.99
Weighted-Average Grant-Date Fair Value, Granted	208.67	$ 162.32	$ 168.95
Weighted-Average Grant-Date Fair Value, Vested	159.05
Weighted-Average Grant-Date Fair Value, Forfeited	177.41
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 184.93	$ 160.99
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	141,661
Number of Shares, Granted	30,647
Number of Shares, Vested	(96,981)
Number of Shares, Unvested, December 31, 2019	75,327	141,661
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 124.81
Weighted-Average Grant-Date Fair Value, Granted	172.95	$ 155.85	194.19
Weighted-Average Grant-Date Fair Value, Vested	95.47
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 185.86	$ 124.81
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	117,915
Number of Shares, Granted	74,074
Number of Shares, Vested	(9,035)
Number of Shares, Unvested, December 31, 2019	182,954	117,915
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 165.48
Weighted-Average Grant-Date Fair Value, Granted	214.70	$ 167.74	$ 198.72
Weighted-Average Grant-Date Fair Value, Vested	120.46
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 189.24	$ 165.48

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

Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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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).

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-Publisher FASB
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-Topic 718
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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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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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

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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