EARNINGS PER SHARE - Computation of Basic Earnings and Diluted Earnings Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator for basic and diluted earnings per share:
Net income, basic	$ 165,919	$ 164,240	$ 161,458
Net income, diluted	$ 165,919	$ 164,240	$ 161,458
Denominator:
Weighted-average basic common shares outstanding	42,024	41,544	40,848
Assumed conversion of dilutive securities:
Stock awards (in shares)	745	855	1,382
Convertible Senior Notes (in shares)	0	0	14
Denominator for diluted earnings per share - Adjusted weighted-average shares	42,769	42,399	42,244
Earnings per common share:
Basic (in dollars per share)	$ 3.95	$ 3.95	$ 3.95
Diluted (in dollars per share)	$ 3.88	$ 3.87	$ 3.82