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Per Share Data
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Per Share Data
3. Per Share Data
Basic earnings per share are computed using net income attributable to common shareholders and the weighted average number of common shares outstanding. Diluted earnings per share reflect common shares issuable from the assumed conversion of common share options and share awards granted and units convertible into common shares. Only those items having a dilutive impact on our basic earnings per share are included in diluted earnings per share. Our unvested share-based awards are considered participating securities and are reflected in the calculation of basic and diluted earnings per share using the two-class method. The number of common share equivalent securities excluded from the diluted earnings per share calculation was approximately 1.9 million, 1.1 million, and 2.1 million for the years ended December 31, 2020, 2019, and 2018, respectively. These securities, which include common share options and share awards granted and units convertible into common shares, were excluded from the diluted earnings per share calculation as they are anti-dilutive.
The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:
 Year Ended December 31,
(in thousands, except per share amounts)202020192018
Earnings per common share calculation – basic
Income from continuing operations attributable to common shareholders
$123,911 $219,623 $156,128 
Amount allocated to participating securities(261)(539)(1,107)
Net income attributable to common shareholders – basic$123,650 $219,084 $155,021 
Total earnings per common share – basic
$1.24 $2.23 $1.63 
Weighted average number of common shares outstanding – basic99,385 98,460 95,208 
Earnings per common share calculation – diluted
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities
$123,650 $219,084 $155,021 
Income allocated to common units from continuing operations— 1,593 — 
Net income attributable to common shareholders – diluted$123,650 $220,677 $155,021 
Total earnings per common share – diluted
$1.24 $2.22 $1.63 
Weighted average number of common shares outstanding – basic99,385 98,460 95,208 
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted53 119 158 
Common units— 805 — 
Weighted average number of common shares outstanding – diluted99,438 99,384 95,366