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Capital Stock (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Capital Stock

The following is a schedule of changes in the number of common shares outstanding since the beginning of 2016:

 

 

 

Nine Months
Ended
September 30,
2017

 

 

Year
Ended
December 31,
2016

 

Beginning balance

 

 

247,144,356

 

 

 

169,316,460

 

MRD Merger

 

 

—

 

 

 

77,042,749

 

Restricted stock grants

 

 

536,536

 

 

 

490,609

 

Restricted stock units vested

 

 

341,358

 

 

 

266,541

 

PSU-TSR units settled

 

 

85,461

 

 

 

—

 

Shares retired

 

 

—

 

 

 

(739

)

Treasury shares issued

 

 

15,580

 

 

 

28,736

 

Ending balance

 

 

248,123,291

 

 

 

247,144,356