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EARNINGS PER SHARE (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings per Common Share
Basic and diluted earnings per common share were calculated as follows (in thousands, except per share amounts):
 
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Basic weighted average number of shares outstanding37,647 37,607 37,703 37,763 
Effect of dilutive securities:
Unvested restricted stock582 798 582 728 
Diluted average shares outstanding38,229 38,405 38,285 38,491 
Net earnings$200,752 $109,118 $499,984 $270,948 
Basic earnings per share$5.33 $2.90 $13.26 $7.17 
Diluted earnings per share$5.25 $2.84 $13.06 $7.04