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Earnings per share
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share. Basic earnings per share (EPS) attributable to Stewart is calculated by dividing net income attributable to Stewart by the weighted-average number of shares of Common Stock outstanding during the reporting periods. Outstanding shares of Common Stock granted to employees that are not yet vested (restricted shares) are excluded from the calculation of the weighted-average number of shares outstanding for calculating basic EPS. To calculate diluted EPS, the number of shares is adjusted to include the number of additional shares that would have been outstanding if restricted units and shares were vested and stock options were exercised. In periods of loss, dilutive shares are excluded from the calculation of the diluted EPS and diluted EPS is computed in the same manner as basic EPS.

The calculation of the basic and diluted EPS is as follows:
 Three Months Ended 
 September 30,
Nine Months Ended 
 September 30,
 2021202020212020
($000 omitted, except per share)
Numerator:
Net income attributable to Stewart88,663 55,909 237,718 95,232 
Denominator (000):
Basic average shares outstanding26,873 25,148 26,803 24,151 
Average number of dilutive shares relating to options190 — 160 — 
Average number of dilutive shares relating to grants of restricted units and shares175 149 127 105 
Diluted average shares outstanding27,238 25,297 27,090 24,256 
Basic earnings per share attributable to Stewart3.30 2.22 8.87 3.94 
Diluted earnings per share attributable to Stewart3.26 2.21 8.78 3.93