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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Restricted Stock and Units Activity

The following table summarizes the activity related to restricted stock unit (RSU) share based payment awards:

		Number of Shares				Weighted- Average Grant-Date Fair Value
Unvested, January 1, 2021			192,624			$	160.99
Granted			116,024				208.67
Vested			(78,455	)			159.05
Forfeited			(3,209	)			177.41
Unvested, December 31, 2021			226,984			$	184.93

The weighted average grant-date fair value of RSU awards granted was $208.67, $162.32 and $168.95 during the years ended December 31, 2021, 2020 and 2019, respectively. The fair value as of the respective vesting dates of RSUs was $15.1 million for the year ended December 31, 2021 and $7.7 million for both years ended December 31, 2020 and 2019.

The following table summarizes the activity related to restricted stock award (RSA) share based payment awards:

		Number of Shares				Weighted- Average Grant-Date Fair Value
Unvested, January 1, 2021			141,661			$	124.81
Granted			30,647				172.95
Vested			(96,981	)			95.47
Unvested, December 31, 2021			75,327			$	185.86

Schedule of Nonvested Performance-Based Units Activity

The following table summarizes the activity related to performance unit awards (PSU) share based payment awards:

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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