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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)
 6 Months Ended
Jun. 30, 2020
Defined Benefit Plan [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS

The following tables set 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
 
June 30,
 
June 30,
 
2020
 
2019
 
2020
 
2019
 
(Thousands of dollars)
Components of net periodic benefit cost (income)
 
 
 
 
 
 
 

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 (income) 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 $1.0 million and $0.8 million reclassified to income tax (expense) benefit for the three months ended June 30, 2020 and 2019, respectively.

 
Retirement Benefits
 
Other Postretirement Benefits
 
Six Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2020
 
2019
 
2020
 
2019
 
(Thousands of dollars)
Components of net periodic benefit cost (income)
 
 
 
 
 
 
 

Service cost
$
4,072

 
$
3,908

 
$
230

 
$
234

Interest cost
9,148

 
10,252

 
884

 
1,018

Expected return on plan assets
(12,464
)
 
(11,784
)
 
(1,444
)
 
(1,140
)
Amortization of prior service cost (credit) (a)
56

 
—

 
—

 
(114
)
Amortization of net loss (a)
9,142

 
6,316

 
2

 
148

Net periodic benefit cost (income)
$
9,954

 
$
8,692

 
$
(328
)
 
$
146

(a) - These components of net periodic benefit cost (income) 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 $2.1 million and $1.5 million reclassified to income tax (expense) benefit for the six months ended June 30, 2020 and 2019, respectively.