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EMPLOYEE BENEFIT PLANS
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE 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.