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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computation of net income per common share
(Thousands of dollars except per share data)
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
 
2012
 
2013
 
2012
Basic
 
 
 
 
 
 
 
Average common shares outstanding
101,665,737

 
101,446,643

 
101,813,398

 
101,758,496

 
 
 
 
 
 
 
 
Net income
$
257,287

 
$
227,813

 
$
373,472

 
$
328,029

Less net income allocated to unvested restricted shares
(1,639
)
 
(1,908
)
 
(2,278
)
 
(2,689
)
Net income allocated to common shares
$
255,648

 
$
225,905

 
$
371,194

 
$
325,340

Basic net income per common share
$
2.51

 
$
2.23

 
$
3.65

 
$
3.20

 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Average common shares outstanding
101,665,737

 
101,446,643

 
101,813,398

 
101,758,496

Stock options and other contingently issuable shares (1)
2,231,043

 
2,556,485

 
2,218,320

 
2,341,550

Average common shares outstanding assuming dilution
103,896,780

 
104,003,128

 
104,031,718

 
104,100,046

 
 
 
 
 
 
 
 
Net income
$
257,287

 
$
227,813

 
$
373,472

 
$
328,029

Less net income allocated to unvested restricted shares
 
 
 
 
 
 
 
assuming dilution
(1,607
)
 
(1,865
)
 
(2,235
)
 
(2,633
)
Net income allocated to common shares assuming
 
 
 
 
 
 
 
dilution
$
255,680

 
$
225,948

 
$
371,237

 
$
325,396

Diluted net income per common share
$
2.46

 
$
2.17

 
$
3.57

 
$
3.13

 
(1) 
There were no options excluded due to their anti-dilutive effect for the three and six months ended June 30, 2013 and 2012.