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Benefit Plans | 6 Months Ended
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Jun. 30, 2022
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, 2022 and 2021.
Components of net periodic benefit cost
Table | 10.1 |  |  |  |  |  |  |  |
|  | Three Months Ended June 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost |  | $ | 1,869 |  |  | $ | 2,152 |  |  | $ | 306 |  |  | $ | 390 |
Interest cost |  | 2,848 |  |  | 2,779 |  |  | 171 |  |  | 160 |
Expected return on plan assets |  | (4,864) |  |  | (5,256) |  |  | (2,626) |  |  | (2,216) |
Amortization of net actuarial losses (gains) |  | 1,349 |  |  | 1,255 |  |  | (798) |  |  | (409) |
Amortization of prior service cost (credit) |  | (53) |  |  | (59) |  |  | 122 |  |  | 53 |
Net periodic benefit cost (benefit) |  | $ | 1,149 |  |  | $ | 871 |  |  | $ | (2,825) |  |  | $ | (2,022) |
Components of net periodic benefit cost
Table | 10.2 |  |  |  |  |  |  |  |
|  | Six Months Ended June 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost |  | $ | 3,626 |  |  | $ | 3,816 |  |  | $ | 654 |  |  | $ | 754 |
Interest cost |  | 5,725 |  |  | 5,589 |  |  | 348 |  |  | 324 |
Expected return on plan assets |  | (9,816) |  |  | (10,458) |  |  | (5,251) |  |  | (4,431) |
Amortization of net actuarial losses (gains) |  | 2,532 |  |  | 2,805 |  |  | (1,552) |  |  | (848) |
Amortization of prior service cost (credit) |  | (106) |  |  | (119) |  |  | 244 |  |  | 106 |
Net periodic benefit cost (benefit) |  | $ | 1,961 |  |  | $ | 1,633 |  |  | $ | (5,557) |  |  | $ | (4,095) |
In July 2022, we made a contribution totaling $6.3 million to our qualified pension plan.

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