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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Capital Stock [Abstract]  
Summary of Common Share Activity
A summary of common share activity for the years ended December 31 follows (in shares):
 
 
2015
 
2014
 
2013
Common shares outstanding at January 1
 
139,000,471

 
138,207,889

 
143,136,473

Shares repurchased
 
(165,138
)
 
(36,702
)
 
(6,925,789
)
Shares issued upon exercise of employee stock options
 
207,890

 
744,431

 
855,061

Restricted stock issued to employees, net of forfeitures
 
375,575

 
60,933

 
1,115,484

Shares issued to non-employee directors
 
22,500

 
23,920

 
26,660

Common shares outstanding at December 31
 
139,441,298

 
139,000,471

 
138,207,889