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Health Care, Pension and Other Benefits
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
HEALTH CARE, PENSION AND OTHER BENEFITS
HEALTH CARE, PENSION AND OTHER BENEFITS
Shown below are the components of the Company’s net periodic benefit cost (credit) for domestic defined benefit pension plans, foreign defined benefit pension plans and postretirement benefits other than pensions: 
(Thousands of dollars)
Domestic Defined
Benefit Pension Plans
 
Foreign Defined
Benefit Pension Plans
 
Postretirement
Benefits Other than
Pensions
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Three Months Ended March 31:
 
 
 
 
 
 
 
 
 
 
 
Net periodic benefit cost (credit):
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
5,754

 
$
5,637

 
$
1,325

 
$
1,547

 
$
621

 
$
609

Interest cost
6,237

 
6,526

 
2,271

 
2,694

 
2,795

 
3,195

Expected return on assets
(13,024
)
 
(12,666
)
 
(2,431
)
 
(2,740
)
 
 
 
 
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
327

 
459

 
 
 
 
 
(1,132
)
 
(126
)
Actuarial loss
843

 
 
 
485

 
356

 
253

 
 
Net periodic benefit cost (credit)
$
137

 
$
(44
)
 
$
1,650

 
$
1,857

 
$
2,537

 
$
3,678


For further details on the Company’s health care, pension and other benefits, see Note 6 to the Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.