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EARNINGS PER SHARE
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE
Basic earnings and diluted earnings per share data were computed as follows:
 Years Ended December 31,
 202020192018
Numerator for basic and diluted earnings per share:   
Net income$194,820 $146,527 $147,462 
Denominator:   
Weighted-average basic common shares outstanding40,035 38,640 38,445 
Assumed conversion of dilutive securities:   
Share-based awards1,491 1,465 1,678 
Denominator for diluted earnings per share
   - Adjusted weighted-average shares
41,526 40,105 40,123 
Earnings per common share:   
Basic$4.87 $3.79 $3.84 
Diluted$4.69 $3.65 $3.68 
Share-based awards representing the right to purchase common stock of 132,000 shares in 2020, 633,000 shares in 2019, and 888,000 shares in 2018 were not included in the computation of diluted earnings per share because their inclusion would have had an anti-dilutive effect.