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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)
 6 Months Ended
Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE 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 BenefitsOther Postretirement Benefits
Three Months EndedThree Months Ended
June 30,June 30,
 2021202020212020
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$2,076 $2,036 $95 $115 
Interest cost4,220 4,574 284 442 
Expected return on plan assets(6,269)(6,232)42 (722)
Amortization of prior service cost (a)28 28 — — 
Amortization of net loss (a)4,913 4,571 1,841 1 
Net periodic benefit cost (income)$4,968 $4,977 $2,262 $(164)
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $1.6 million and $1.0 million reclassified to income tax (expense) benefit for the three months ended June 30, 2021 and 2020, respectively.

 Retirement BenefitsOther Postretirement Benefits
Six Months EndedSix Months Ended
June 30,June 30,
 2021202020212020
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$4,152 $4,072 $210 $230 
Interest cost8,440 9,148 726 884 
Expected return on plan assets(12,538)(12,464)(680)(1,444)
Amortization of prior service cost (a)56 56 — — 
Amortization of net loss (a)9,826 9,142 1,842 2 
Net periodic benefit cost (income)$9,936 $9,954 $2,098 $(328)
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other expense in our Consolidated Statements of Income, with related income tax benefits of $2.7 million and $2.1 million reclassified to income tax (expense) benefit for the six months ended June 30, 2021 and 2020, respectively.