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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Components of net periodic benefit cost for retirement and other postretirement benefit plans

The following table sets forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:
 
Retirement Benefits
 
Other Postretirement Benefits
 
Three Months Ended
 
Three Months Ended
 
March 31,
 
March 31,
 
2020
 
2019
 
2020
 
2019
 
(Thousands of dollars)
Components of net periodic benefit cost
 
 
 
 
 
 
 

Service cost
$
2,036

 
$
1,954

 
$
115

 
$
117

Interest cost
4,574

 
5,126

 
442

 
509

Expected return on plan assets
(6,232
)
 
(5,892
)
 
(722
)
 
(570
)
Amortization of prior service cost (credit) (a)
28

 
—

 
—

 
(57
)
Amortization of net loss (a)
4,571

 
3,158

 
1

 
74

Net periodic benefit cost (income)
$
4,977

 
$
4,346

 
$
(164
)
 
$
73

(a) - These components of net periodic benefit cost are recognized in accumulated other comprehensive loss and are reclassified to other income (expense) in our Consolidated Statements of Income, with related income tax benefits of $1.1 million and $0.7 million reclassified to income tax (expense) benefit for the three months ended March 31, 2020 and 2019, respectively.