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Capital Stock (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Capital Stock

The following is a schedule of changes in the number of common shares outstanding since the beginning of 2017:

 

 

 

Six Months
Ended
June 30,
2018

 

 

Year
Ended
December 31,
2017

 

Beginning balance

 

 

248,129,430

 

 

 

247,144,356

 

Restricted stock grants

 

 

804,768

 

 

 

539,096

 

Restricted stock units vested

 

 

411,959

 

 

 

344,937

 

Performance stock units issued

 

 

76,149

 

 

 

85,461

 

Treasury shares issued

 

 

4,900

 

 

 

15,580

 

Ending balance

 

 

249,427,206

 

 

 

248,129,430