SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Basic (in shares)	19,244	18,996	18,617
Effect of dilutive stock options (in shares)	374	582	810
Diluted (in shares)	19,618	19,578	19,427
Per Share Amount
Basic (in dollars per share)	$ 4.28	$ 4.60	$ 3.68
Effect of dilutive stock options (in dollars per share)	(0.08)	(0.13)	(0.15)
Diluted (in dollars per share)	$ 4.20	$ 4.47	$ 3.53