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Net Income Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Basic
 
 
 
 
 
 
 
Average common shares outstanding
91,788,734

 
92,260,367

 
91,632,297

 
92,500,213

Net income
$
378,064

 
$
349,937

 
$
542,940

 
$
481,341

Basic net income per common share
$
4.12

 
$
3.79

 
$
5.93

 
$
5.20

 
 
 
 
 
 
 
 
Diluted
 
 
 
 
 
 
 
Average common shares outstanding
91,788,734

 
92,260,367

 
91,632,297

 
92,500,213

Stock options and other contingently issuable shares (1)
2,318,192

 
1,864,328

 
2,114,844

 
1,926,978

Non-vested restricted stock grants
562,825

 
467,362

 
558,856

 
500,479

Average common shares outstanding assuming dilution
94,669,751

 
94,592,057

 
94,305,997

 
94,927,670

 
 
 
 
 
 
 
 
Net income
$
378,064

 
$
349,937

 
$
542,940

 
$
481,341

Diluted net income per common share
$
3.99

 
$
3.70

 
$
5.76

 
$
5.07

 
(1) 
Stock options and other contingently issuable shares excluded 16,013 and 47,273 shares due to their anti-dilutive effect for the three and six months ended June 30, 2016. Stock options and other contingently issuable shares excluded 21,243 shares due to their anti-dilutive effect for the three and six months ended June 30, 2015.