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Incentive Plans (Tables)
3 Months Ended
Mar. 31, 2015
Incentive Plans [Abstract]  
Share-Based Plans, Amounts Recognized

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended

 

March 31,

(Thousands of dollars)

2015

 

2014

Compensation charged against income before tax benefit

$

16,315 

 

 

15,301 

Related income tax benefit recognized in income

 

5,100 

 

 

4,733