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Benefit Plans
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
Tables 10.1 and 10.2 provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three and nine months ended September 30, 2021 and 2020.
Components of net periodic benefit cost
Table
10.1
Three Months Ended September 30,
Pension and Supplemental Executive Retirement PlansOther Postretirement Benefit Plans
(In thousands)2021202020212020
Service cost$1,908 $1,848 $377 $316 
Interest cost2,794 3,375 163 208 
Expected return on plan assets(5,229)(5,526)(2,216)(1,852)
Amortization of net actuarial losses (gains)1,403 1,580 (425)(196)
Amortization of prior service cost (credit)(60)(62)53 13 
Cost of settlements4,732 6,520  — 
Net periodic benefit cost (benefit)$5,548 $7,735 $(2,048)$(1,511)

Components of net periodic benefit cost
Table10.2
Nine Months Ended September 30,
Pension and Supplemental Executive Retirement PlansOther Postretirement Benefit Plans
(In thousands)2021202020212020
Service cost$5,724 $5,545 $1,131 $947 
Interest cost8,383 10,125 487 624 
Expected return on plan assets(15,687)(16,579)(6,647)(5,556)
Amortization of net actuarial losses (gains)4,208 4,740 (1,273)(587)
Amortization of prior service cost (credit)(179)(186)159 38 
Cost of settlements4,732 6,520  — 
Net periodic benefit cost (benefit)$7,181 $10,165 $(6,143)$(4,534)

Contributions of $6.9 million have been made to our qualified pension and supplemental executive retirement plan in 2021. We recorded pension settlement accounting charges of $4.7 million and $6.5 million in 2021 and 2020, respectively.