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Benefit Plans
6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020.
Components of net periodic benefit cost
Table
10.1
Three Months Ended June 30,
Pension and Supplemental Executive Retirement PlansOther Postretirement Benefit Plans
(In thousands)2021202020212020
Service cost$2,152 $1,876 $390 $322 
Interest cost2,779 3,336 160 202 
Expected return on plan assets(5,256)(5,473)(2,216)(1,852)
Amortization of net actuarial losses (gains)1,255 1,526 (409)(201)
Amortization of prior service cost (credit)(59)(62)53 12 
Net periodic benefit cost (benefit)$871 $1,203 $(2,022)$(1,517)

Components of net periodic benefit cost
Table10.2
Six Months Ended June 30,
Pension and Supplemental Executive Retirement PlansOther Postretirement Benefit Plans
(In thousands)2021202020212020
Service cost$3,816 $3,697 $754 $631 
Interest cost5,589 6,750 324 416 
Expected return on plan assets(10,458)(11,053)(4,431)(3,704)
Amortization of net actuarial losses (gains)2,805 3,160 (848)(391)
Amortization of prior service cost (credit)(119)(124)106 25 
Net periodic benefit cost (benefit)$1,633 $2,430 $(4,095)$(3,023)
In July 2021, we made a contribution of $6.8 million to our qualified pension plan.