EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 276,466	$ 206,115	$ 293,109
Denominator (shares in 000's):
Basic weighted average shares outstanding (in shares)	59,309,000	59,633,000	61,960,000
Effect of dilutive securities - stock options and awards (in shares)	753,000	615,000	698,000
Diluted weighted average shares outstanding (in shares)	60,062,000	60,248,000	62,658,000
Basic earnings per share (in dollars per share)	$ 4.66	$ 3.46	$ 4.73
Diluted earnings per share (in dollars per share)	$ 4.60	$ 3.42	$ 4.68
Anti-dilutive shares excluded from the computation of diluted earnings per share	2,949	615,302	524,110