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v3.22.1

Pension and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits | Pension and Other Postretirement Benefits Components of net periodic benefit cost were as follows:
|  | Pension Benefits |  | Postretirement Benefits
|  | Three months ended March 31,
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Components of net periodic benefit cost |  |  |  |  |  |  |  |
Service cost |  | $ | 2,007 |  |  | $ | 2,135 |  |  | $ | 160 |  |  | $ | 162 |
Interest cost |  | 2,234 |  |  | 1,951 |  |  | 84 |  |  | 75 |
Expected return on plan assets |  | (1,871) |  |  | (2,547) |  |  | — |  |  | — |
Settlement expense |  | — |  |  | 1,419 |  |  | — |  |  | — |
Amortization of net loss (gain) |  | 935 |  |  | 1,421 |  |  | (152) |  |  | (65) |
Amortization of prior service cost (credit) |  | 69 |  |  | 71 |  |  | (34) |  |  | (34) |
Net periodic benefit cost |  | $ | 3,374 |  |  | $ | 4,450 |  |  | $ | 58 |  |  | $ | 138 |
The non-service cost components of net periodic benefit cost are included in other expense, net in the unaudited condensed consolidated statements of operations.

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