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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2020
Defined Benefit Plan [Abstract]  
Components of net periodic benefit cost for retirement and other postretirement 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 BenefitsOther Postretirement Benefits
Three Months EndedThree Months Ended
September 30,September 30,
 2020201920202019
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$2,036 $1,954 $115 $117 
Interest cost4,574 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 $1.1 million and $0.7 million reclassified to income tax expense for the three months ended September 30, 2020 and 2019, respectively.
 Retirement BenefitsOther Postretirement Benefits
Nine Months EndedNine Months Ended
September 30,September 30,
 2020201920202019
 
(Thousands of dollars)
Components of net periodic benefit cost (income)    
Service cost$6,108 $5,862 $345 $351 
Interest cost13,722 15,378 1,326 1,527 
Expected return on plan assets(18,696)(17,676)(2,166)(1,710)
Amortization of prior service cost (credit) (a)84 —  (171)
Amortization of net loss (a)13,713 9,474 3 222 
Net periodic benefit cost (income)$14,931 $13,038 $(492)$219 
(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 $3.2 million and $2.2 million reclassified to income tax expense for the nine months ended September 30, 2020 and 2019, respectively.