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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
The components of net periodic benefit cost (income) related to our defined benefit plans
The components of net periodic benefit cost (income) related to our defined benefit plans were as follows:
 
Pension Plans (a)
 
Other Postretirement
Benefit Plans
 
2015
 
2014
 
2015
 
2014
 
(Thousands of Dollars)
For the three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
1,919

 
$
2,012

 
$
118

 
$
94

Interest cost
1,097

 
1,057

 
112

 
93

Expected return on assets
(1,254
)
 
(1,144
)
 
—

 
—

Amortization of prior service credit
(516
)
 
(516
)
 
(286
)
 
(286
)
Amortization of net loss
461

 
45

 
67

 
28

Net periodic benefit cost (income)
$
1,707

 
$
1,454

 
$
11

 
$
(71
)
(a)
Includes amounts related to the pension plan and the excess pension plan.