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Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Computation of net income per common share
(Thousands of dollars except per share data)
Three Months Ended
March 31,
 
2014
 
2013
Basic
 
 
 
Average common shares outstanding
98,833,210

 
101,961,059

 
 
 
 
Net income
$
115,457

 
$
116,185

Less net income allocated to unvested restricted shares
(523
)
 
(639
)
Net income allocated to common shares
$
114,934

 
$
115,546

Basic net income per common share
$
1.16

 
$
1.13

 
 
 
 
Diluted
 
 
 
Average common shares outstanding
98,833,210

 
101,961,059

Stock options and other contingently issuable shares (1)
2,025,671

 
2,295,204

Average common shares outstanding assuming dilution
100,858,881

 
104,256,263

 
 
 
 
Net income
$
115,457

 
$
116,185

Less net income allocated to unvested restricted shares
 
 
 
assuming dilution
(515
)
 
(628
)
Net income allocated to common shares assuming
 
 
 
dilution
$
114,942

 
$
115,557

Diluted net income per common share
$
1.14

 
$
1.11

 
(1) 
Stock options and other contingently issuable shares excluded 2,932 shares for the three months ended March 31, 2014. There were no options excluded due to their anti-dilutive effect for the three months ended March 31, 2013.