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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS

In August 2015, we contributed $8.0 million to the pension plan. 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 September 30:
 
 
 
 
 
 
 
Service cost
$
1,919

 
$
2,012

 
$
118

 
$
94

Interest cost
1,097

 
1,056

 
111

 
93

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

 
—

Amortization of prior service credit
(516
)
 
(516
)
 
(285
)
 
(286
)
Amortization of net loss
461

 
197

 
67

 
29

Other (b)
—

 
175

 
—

 
—

Net periodic benefit cost (income)
$
1,707

 
$
1,780

 
$
11

 
$
(70
)
 
 
 
 
 
 
 
 
For the nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
5,757

 
$
6,036

 
$
354

 
$
282

Interest cost
3,291

 
3,169

 
334

 
279

Expected return on assets
(3,762
)
 
(3,432
)
 
—

 
—

Amortization of prior service credit
(1,547
)
 
(1,548
)
 
(857
)
 
(858
)
Amortization of net loss (gain)
1,383

 
(18
)
 
201

 
85

Other (b)
—

 
(39
)
 
—

 
—

Net periodic benefit cost (income)
$
5,122

 
$
4,168

 
$
32

 
$
(212
)
(a)
Includes amounts related to the pension plan and the excess pension plan.
(b)
In 2014, other relates to a settlement credit associated with the supplemental executive retirement plan in the second quarter and a settlement charge associated with the excess pension plan in the third quarter.