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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Capital Stock [Abstract]  
Summary of Common Share Activity
A summary of common share activity for the years ended December 31 follows (in shares):
 
 
2018
 
2017
 
2016
Common shares outstanding at January 1
 
134,275,609

 
139,840,228

 
139,441,298

Shares repurchased
 
(92,167
)
 
(6,157,010
)
 
(162,563
)
Shares issued upon exercise of employee stock options
 
—

 
299,050

 
348,640

Restricted stock issued to employees, net of forfeitures
 
958,672

 
269,025

 
187,209

Shares issued to non-employee directors
 
31,834

 
24,316

 
25,644

Common shares outstanding at December 31
 
135,173,948

 
134,275,609

 
139,840,228