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Earnings per Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share
19. Earnings per Share

The following table sets forth a reconciliation of the information used in computing basic and diluted earnings per share:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Net earnings$264,508 $124,766 $497,277 $301,045 
Basic earnings per common share:  
Net earnings$1.84 $0.87 $3.46 $2.09 
Weighted average shares outstanding143,941,000 143,955,000 143,854,000 144,107,000 
Diluted earnings per common share:  
Net earnings$1.82 $0.86 $3.43 $2.07 
Weighted average shares outstanding145,118,000 144,995,000 145,040,000 145,359,000 

The following table is a reconciliation of the share amounts used in computing earnings per share:
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Weighted average shares outstanding - Basic143,941,000 143,955,000 143,854,000 144,107,000 
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs1,177,000 1,040,000 1,186,000 1,252,000 
Weighted average shares outstanding - Diluted145,118,000 144,995,000 145,040,000 145,359,000 

Diluted earnings per share amounts are computed using the weighted average number of common shares outstanding and, if dilutive, potential common shares outstanding during the period. Potential common shares consist of the incremental common shares issuable upon the exercise of SARs and vesting of performance shares and RSUs, as determined using the treasury stock method.  
There were no anti-dilutive potential common shares excluded from the calculation above for the three months ended June 30, 2021. The weighted average number of anti-dilutive potential common shares excluded from the calculation above were approximately 121,000 for the three months ended June 30, 2020, and 34,000 and 130,000 for the six months ended June 30, 2021 and 2020, respectively.