STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022		226,984		$	184.93
Granted		124,772			140.37
Vested		(101,909	)		176.84
Forfeited		(19,624	)		175.29
Unvested, December 31, 2022		230,223		$	165.10

The weighted average grant-date fair value per unit of RSU awards granted was $140.37, $208.67 and $162.32 during the years ended December 31, 2022, 2021 and 2020, respectively. The grant date fair value of RSUs that vested during the year was $18.0 million for the year ended December 31, 2022, $12.5 million for the year ended December 31, 2021 and $6.5 million for the year ended December 31, 2020. The fair value of RSUs as of their respective vesting dates was $15.3 million for the year ended December 31, 2022, $15.1 million for the year ended December 31, 2021 and $7.7 million for the year ended December 31, 2020.

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, 2022		75,327		$	185.86
Granted		2,024			148.35
Vested		(43,714	)		189.88
Unvested, December 31, 2022		33,637		$	178.37

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, 2022		182,954		$	189.24
Granted		101,889			186.66
Vested		(11,364	)		163.23
Forfeited		(45,613	)		199.77
Unvested, December 31, 2022		227,866		$	185.57