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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net income $ 127,823 $ 96,105 $ 253,853 $ 170,282
Denominator (shares in 000's):        
Basic weighted average shares outstanding (in shares) 58,016,000 59,464,000 58,311,000 59,553,000
Effect of dilutive securities - Stock options and awards (in shares) 672,000 700,000 659,000 676,000
Diluted weighted average shares outstanding (in shares) 58,688,000 60,164,000 58,970,000 60,229,000
Basic earnings per share (in dollars per share) $ 2.20 $ 1.62 $ 4.35 $ 2.86
Diluted earnings per share (in dollars per share) $ 2.18 $ 1.60 $ 4.30 $ 2.83
Anti-dilutive shares excluded from the computation of diluted earnings per share 62,987 179,861 108,497 134,388