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Net Income Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Computation of net income per common share
(Thousands of dollars except per share data)
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Basic
 
 
 
 
 
 
 
Average common shares outstanding
91,992,854

 
92,196,458

 
91,752,482

 
92,398,962

Net income
$
386,733

 
$
374,491

 
$
929,673

 
$
855,832

Basic net income per common share
$
4.20

 
$
4.06

 
$
10.13

 
$
9.26

 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Average common shares outstanding
91,992,854

 
92,196,458

 
91,752,482

 
92,398,962

Stock options and other contingently issuable shares (1)
2,218,617

 
1,698,414

 
2,109,359

 
1,864,371

Non-vested restricted stock grants
560,336

 
538,203

 
559,349

 
513,054

Average common shares outstanding assuming dilution
94,771,807

 
94,433,075

 
94,421,190

 
94,776,387

 
 
 
 
 
 
 
 
Net income
$
386,733

 
$
374,491

 
$
929,673

 
$
855,832

Diluted net income per common share
$
4.08

 
$
3.97

 
$
9.85

 
$
9.03

 
(1) 
Stock options and other contingently issuable shares for the three and nine months ended September 30, 2016 excluded 32,633 and 63,310 shares, respectively, due to their anti-dilutive effect. Stock options and other contingently issuable shares for the three and nine months ended September 30, 2015 excluded 34,473 and 31,615 shares, respectively, due to their anti-dilutive effect .