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Capital Stock (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Capital Stock The following is a schedule of changes in the number of common shares outstanding since the beginning of 2018:

 

 

 

Six Months
Ended
June 30,
2019

 

 

Year
Ended
December 31,
2018

 

Beginning balance

 

 

249,510,022

 

 

 

248,129,430

 

Restricted stock grants

 

 

1,143,765

 

 

 

865,095

 

Restricted stock units vested

 

 

677,436

 

 

 

434,046

 

Performance stock units issued

 

 

12,283

 

 

 

73,985

 

Performance stock dividends

 

 

464

 

 

 

2,164

 

Treasury shares issued

 

 

—

 

 

 

5,302

 

Ending balance

 

 

251,343,970

 

 

 

249,510,022