STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023		230,223		$	165.13
Granted		121,896			136.22
Vested		(132,010	)		163.85
Forfeited		(3,623	)		152.21
Unvested, December 31, 2023		216,486		$	149.68

The weighted average grant-date fair value per unit of RSU awards granted was $136.22, $140.37 and $208.67 during the years ended December 31, 2023, 2022 and 2021, respectively. The grant date fair value of RSUs that vested during the year was $21.6 million for the year ended December 31, 2023, $18.0 million for the year ended December 31, 2022 and $12.5 million for the year ended December 31, 2021. The fair value of RSUs as of their respective vesting dates was $18.6 million for the year ended December 31, 2023, $15.3 million for the year ended December 31, 2022 and $15.1 million for the year ended December 31, 2021.

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, 2023		33,637		$	178.37
Granted		2,366			126.87
Vested		(18,456	)		178.82
Unvested, December 31, 2023		17,547		$	170.96

Schedule of Nonvested Performance-Based Units Activity

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

	Number of Shares			Weighted- Average Grant-Date Fair Value
Unvested, January 1, 2023		227,866		$	185.57
Granted		84,448			165.72
Vested		(11,970	)		155.85
Forfeited		(91,791	)		170.96
Unvested, December 31, 2023		208,553		$	185.86