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Earnings per share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings per share Earnings per share
The Company calculates earnings per share in accordance with FASB guidance on earnings per share. Basic and diluted earnings per common share give effect to the change in the number of Company common shares outstanding. The calculation of basic earnings per common share is determined by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the respective periods. The potentially dilutive shares, consisting of outstanding options on common shares, restricted share units, common shares to be issued under the ESPP and performance units, have been included in the computation of diluted net earnings per share and the number of weighted average shares outstanding, except where the result would be anti-dilutive.

The number of stock awards outstanding but not included in the computation of diluted earnings per common share because their effect was anti-dilutive is 1,809,069, 1,182,572 and 1,663,219 for the years ended December 31, 2019, 2020 and 2021, respectively.
Year ended December 31,
201920202021
Net income $304,881 $308,276 $369,448 
Weighted average number of common shares used in computing basic earnings per common share190,074,475 190,396,780 187,802,219 
Dilutive effect of stock-based awards5,086,380 5,384,191 5,159,622 
Weighted average number of common shares used in computing dilutive earnings per common share195,160,855 195,780,971 192,961,841 
Earnings per common share
Basic$1.60 $1.62 $1.97 
Diluted$1.56 $1.57 $1.91