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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Capital Stock The following is a schedule of changes in the number of common shares outstanding since the beginning of 2016:

 

 

Year Ended December 31,

 

 

2018

 

 

2017

 

 

2016

 

 

Beginning balance

 

248,129,430

 

 

 

247,144,356

 

 

 

169,316,460

 

MRD Merger

 

—

 

 

 

—

 

 

 

77,042,749

 

Restricted stock grants

 

865,095

 

 

 

539,096

 

 

 

490,609

 

Restricted stock units vested

 

434,046

 

 

 

344,937

 

 

 

266,541

 

Performance stock units issued

 

76,149

 

 

 

85,461

 

 

 

—

 

Shares retired

 

—

 

 

 

—

 

 

 

(739

)

Treasury shares

 

5,302

 

 

 

15,580

 

 

 

28,736

 

Ending balance

 

249,510,022

 

 

 

248,129,430

 

 

 

247,144,356