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, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator for basic and diluted earnings per share:
Net income	$ 161,458	$ 194,820	$ 146,527
Net income	$ 161,458	$ 194,820	$ 146,527
Denominator:
Weighted-average basic common shares outstanding	40,848	40,035	38,640
Assumed conversion of dilutive securities:
Share-based awards (in shares)	1,382	1,491	1,465
Convertible Senior Notes (in shares)	14	0	0
Denominator for diluted earnings per share    - Adjusted weighted-average shares	42,244	41,526	40,105
Earnings per common share:
Basic (USD per share)	$ 3.95	$ 4.87	$ 3.79
Diluted (USD per share)	$ 3.82	$ 4.69	$ 3.65