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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes)
 9 Months Ended
Sep. 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
September 30,September 30,
 2021202020212020
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$2,076 $2,036 $105 $115 
Interest cost4,220 4,574 363 442 
Expected return on plan assets(6,269)(6,232)(340)(722)
Amortization of prior service cost (a)28 28 — — 
Amortization of net loss (a)4,913 4,571 921 1 
Net periodic benefit cost (income)$4,968 $4,977 $1,049 $(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 $1.3 million and $1.1 million reclassified to income taxes for the three months ended September 30, 2021 and 2020, respectively.

 Retirement BenefitsOther Postretirement Benefits
Nine Months EndedNine Months Ended
September 30,September 30,
 2021202020212020
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$6,228 $6,108 $315 $345 
Interest cost12,660 13,722 1,089 1,326 
Expected return on plan assets(18,807)(18,696)(1,020)(2,166)
Amortization of prior service cost (a)84 84 — — 
Amortization of net loss (a)14,739 13,713 2,763 3 
Net periodic benefit cost (income)$14,904 $14,931 $3,147 $(492)
(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 $4.0 million and $3.2 million reclassified to income taxes for the nine months ended September 30, 2021 and 2020, respectively.