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Retirement and Benefit Plans (Notes) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Retirement and Benefit Plans | Retirement and Benefit Plans The following table presents the pension benefit costs:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| (thousands)
Service cost | $ | — |  |  | $ | 167 |  |  | $ | — |  |  | $ | 501 |
Interest cost | 24 |  |  | 1,474 |  |  | 71 |  |  | 4,420 |
Expected return on plan assets | — |  |  | (1,374) |  |  | — |  |  | (4,120) |
Amortization of actuarial (gain) loss | (5) |  |  | 202 |  |  | (14) |  |  | 605 |
Plan settlement loss | — |  |  | — |  |  | — |  |  | 86 |
Net periodic benefit expense | $ | 19 |  |  | $ | 469 |  |  | $ | 57 |  |  | $ | 1,492 |
Service cost is recorded in the same income statement line items as other employee compensation costs arising from services rendered, and the other components of net periodic benefit expense are recorded in "Pension expense (excluding service costs)" in our Consolidated Statements of Operations. During the nine months ended September 30, 2021, we paid $0.2 million in cash to the nonqualified pension plan participants. For the remainder of 2021, we expect to make approximately $0.1 million in cash payments to our nonqualified pension plan participants.

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