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Capital Stock (Summary of Common Stock Activity) (Details) - shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Common shares outstanding at beginning of period (in shares) 139,441,298 139,000,471 138,207,889
Shares repurchased (in shares) (162,563) (165,138) (36,702)
Shares issued upon exercise of employee stock options (in shares) 348,640 207,890 744,431
Restricted stock issued to employees, net of forfeitures (in shares) 187,209 375,575 60,933
Shares issued to non-employee directors (in shares) 25,644 22,500 23,920
Common shares outstanding at end of period (in shares) 139,840,228 139,441,298 139,000,471