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Share capital (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Common Stock and Treasury Stock Outstanding
The following table presents a summary of the common shares issued and outstanding as of and for the years ended December 31, 2019, 2018 and 2017:
Common shares
2019
 
2018
 
2017
Common shares issued, beginning of period
93,639,610

 
107,227,347

 
106,501,299

Options exercised
187,678

 

 
150,802

Restricted shares granted, net of forfeitures
366,453

 
50,644

 
(35,011
)
Performance restricted shares granted, net of forfeitures and shares withheld
31,757

 
256,106

 
610,257

Retirement of treasury shares and shares repurchased (1)

 
(14,256,043
)
 

Warrants exercised, net (2)

 
361,556

 

Common shares issued, end of period
94,225,498

 
93,639,610

 
107,227,347

Treasury shares, end of year

 

 
(3,944,920
)
Common shares outstanding, end of year
94,225,498

 
93,639,610

 
103,282,427

(1)
Prior to December 31, 2017, common shares repurchased by the Company were not canceled and were classified as treasury shares. Effective January 1, 2018, all treasury shares were retired and subsequent shares repurchased are retired.
(2)
During the year ended December 31, 2018, 1,156,184 warrants were exercised. As a result of the warrant holder electing net settlement, 794,628 of those common shares were withheld by the Company and were subsequently retired, resulting in a net issuance of 361,556 common shares.

Schedule of summary of warrants The following is a summary of warrants as of December 31, 2019:
 
Exercise price
 
Authorized and
issued
 
Aggregated fair
value of
warrants
 
 
Founders
$
10.00

 
2,913,684

 
$
10,884

Advisor
$
10.00

 
581,295

 
2,171

 
 
 
3,494,979

 
$
13,055