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Earnings per Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings Per Share
20. 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 September 30,   Nine Months Ended September 30,  
 2019201820192018
Earnings from continuing operations$206,006  $157,305  $509,796  $433,170  
Loss from discontinued operations, net—  —  —  (4,472) 
Net earnings$206,006  $157,305  $509,796  $428,698  
Basic earnings (loss) per common share:  
Earnings from continuing operations$1.42  $1.07  $3.51  $2.87  
Loss from discontinued operations, net$—  $—  $—  $(0.03) 
Net earnings$1.42  $1.07  $3.51  $2.84  
Weighted average shares outstanding145,372,000  147,344,000  145,276,000  151,177,000  
Diluted earnings (loss) per common share:  
Earnings from continuing operations$1.40  $1.05  $3.47  $2.82  
Loss from discontinued operations, net$—  $—  $—  $(0.03) 
Net earnings$1.40  $1.05  $3.47  $2.79  
Weighted average shares outstanding147,051,000  149,457,000  147,053,000  153,429,000  
The following table is a reconciliation of the share amounts used in computing earnings per share:
 Three Months Ended September 30,   Nine Months Ended September 30,  
 2019201820192018
Weighted average shares outstanding - Basic145,372,000  147,344,000  145,276,000  151,177,000  
Dilutive effect of assumed exercise of SARs and vesting of performance shares and RSUs1,679,000  2,113,000  1,777,000  2,252,000  
Weighted average shares outstanding - Diluted147,051,000  149,457,000  147,053,000  153,429,000  

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.  

The weighted average number of anti-dilutive potential common shares excluded from the calculation above were approximately 28,000 and 10,000 for the three months ended September 30, 2019 and 2018, respectively, and 9,000 and 1,000 for the nine months ended September 30, 2019 and 2018, respectively.