STOCK BASED COMPENSATION - Summary Of Changes In Company's Nonvested Shares (Details)	12 Months Ended
Dec. 31, 2020 $ / shares shares
Restricted Stock Units (RSUs) [Member]
Shares
Shares Nonvested, beginning balance \| shares	3,500
Granted \| shares	17,100
Vested \| shares	(15,600)
Shares Nonvested, ending balance \| shares	5,000
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant-Date Fair Value, beginning balance \| $ / shares	$ 45.70
Granted \| $ / shares	46.13
Vested \| $ / shares	46.32
Weighted-Average Grant-Date Fair Value, ending balance \| $ / shares	$ 45.22
Performance Stock Units [Member]
Shares
Shares Nonvested, beginning balance \| shares	277,085
Granted \| shares	7,053
Vested \| shares	(120,204)
Forfeited \| shares	(6,419)
Shares Nonvested, ending balance \| shares	157,515
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant-Date Fair Value, beginning balance \| $ / shares	$ 44.86
Granted \| $ / shares	44.73
Vested \| $ / shares	44.91
Forfeited \| $ / shares	43.98
Weighted-Average Grant-Date Fair Value, ending balance \| $ / shares	$ 44.85

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

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

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.

+ References

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-Section 50
-Paragraph 2
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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
-Name Accounting Standards Codification
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-Paragraph 2
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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).

+ 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
-Topic 718
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-Paragraph 2
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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