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Pension and Other Postretirement Employee Benefits | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits, Description [Abstract] |
Pension and Other Postretirement Employee Benefits | NO TE 11. PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS The following table details the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB):
|  | Three Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 1,355 |  |  | $ | 1,652 |  |  | $ | 27 |  |  | $ | 79 |
Interest cost |  |  | 3,139 |  |  |  | 2,611 |  |  |  | 294 |  |  |  | 228 |
Expected return on plan assets |  |  | (3,028 | ) |  |  | (2,259 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 10 |  |  |  | 19 |  |  |  | — |  |  |  | 155 |
Amortization of actuarial (gain) loss |  |  | (21 | ) |  |  | 1,150 |  |  |  | (166 | ) |  |  | (96 | )
Total net periodic cost |  | $ | 1,455 |  |  | $ | 3,173 |  |  | $ | 155 |  |  | $ | 366 |
|  | Nine Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 4,066 |  |  | $ | 5,153 |  |  | $ | 82 |  |  | $ | 237 |
Interest cost |  |  | 9,414 |  |  |  | 8,034 |  |  |  | 881 |  |  |  | 686 |
Expected return on plan assets |  |  | (9,081 | ) |  |  | (7,662 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 32 |  |  |  | 55 |  |  |  | — |  |  |  | 467 |
Amortization of actuarial (gain) loss |  |  | (63 | ) |  |  | 4,252 |  |  |  | (498 | ) |  |  | (286 | )
Net periodic cost before pension settlement charge |  |  | 4,368 |  |  |  | 9,832 |  |  |  | 465 |  |  |  | 1,104 |
Pension settlement charge |  |  | — |  |  |  | 14,165 |  |  |  | — |  |  |  | — |
Net periodic cost |  | $ | 4,368 |  |  | $ | 23,997 |  |  | $ | 465 |  |  | $ | 1,104 |
During the nine months ended September 30, 2023 and 2022, funding of pension and other postretirement employee benefit plans w as $2.2 millio n and $3.3 million, respectively. Pension Annuitization In March 2022, we transferred $75.6 million of our qualified pension plan (the Plan) assets to an insurance company for the purchase of a group annuity contract. As a result of the transaction, the insurance company assumed responsibility for annuity administration and benefit payments to select retirees and terminated vested participants, with no change to participants' pension benefits. We recorded a non-cash pretax settlement charge of $14.2 million in non-operating expense, net, as a result of accelerating the recognition of actuarial losses included in Accumulated Other Comprehensive Income that would have been recognized in future periods. The settlement triggered a remeasurement of plan assets and liabilities.

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