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Employee Benefits Plans | 6 Months Ended
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Jun. 30, 2023
Retirement Benefits [Abstract] |
Employee Benefit Plans | (10) Employee Benefit Plans Components of Net Periodic Expense The components of net periodic expense were as follows (in thousands):
| Defined Benefit Pension Plan |  | Supplemental Non-qualified Defined Benefit Plans |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Three Months Ended June 30, | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Service cost | $ | 614 |  | $ | 982 |  | $ | 770 |  | $ | (1,355 | ) | $ | 381 |  | $ | 492 |
Interest cost |  | 4,381 |  |  | 2,704 |  |  | 369 |  |  | 209 |  |  | 594 |  |  | 321 |
Expected return on plan assets |  | (4,672 | ) |  | (4,630 | ) |  | - |  |  | - |  |  | (55 | ) |  | (31 | )
Net amortization of prior service costs |  | (17 | ) |  | (17 | ) |  | - |  |  | - |  |  | 10 |  |  | (73 | )
Recognized net actuarial loss |  | 498 |  |  | 1,523 |  |  | 8 |  |  | 69 |  |  | (3 | ) |  | 16 |
Net periodic expense (benefit) | $ | 804 |  | $ | 562 |  | $ | 1,147 |  | $ | (1,077 | ) | $ | 927 |  | $ | 725 |
| Defined Benefit Pension Plan |  | Supplemental Non-qualified Defined Benefit Plans |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Six Months Ended June 30, | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Service cost | $ | 1,228 |  | $ | 1,964 |  | $ | 1,684 |  | $ | (1,747 | ) | $ | 762 |  | $ | 984 |
Interest cost |  | 8,761 |  |  | 5,409 |  |  | 738 |  |  | 417 |  |  | 1,188 |  |  | 642 |
Expected return on plan assets |  | (9,344 | ) |  | (9,261 | ) |  | - |  |  | - |  |  | (111 | ) |  | (62 | )
Net amortization of prior service costs |  | (34 | ) |  | (34 | ) |  | - |  |  | - |  |  | 20 |  |  | (145 | )
Recognized net actuarial loss (gain) |  | 996 |  |  | 3,046 |  |  | 16 |  |  | 138 |  |  | (6 | ) |  | 32 |
Net periodic expense (benefit) | $ | 1,607 |  | $ | 1,124 |  | $ | 2,438 |  | $ | (1,192 | ) | $ | 1,853 |  | $ | 1,451 |
Plan Contributions Contributions to the Defined Benefit Pension Plan are cash contributions made directly to the Pension Plan Trust account. Contributions to the Postretirement Healthcare and Supplemental Plans are made in the form of benefit payments. Contributions made in the first six months of 2023 and anticipated contributions for 2023 and 2024 are as follows (in thousands):
| Contributions Made |  | Additional Contributions |  | Contributions |
| Six Months Ended June 30, 2023 |  | Anticipated for 2023 |  | Anticipated for 2024 |
Defined Benefit Pension Plan | $ | - |  | $ | - |  | $ | - |
Non-pension Defined Benefit Postretirement Healthcare Plan | $ | 2,460 |  | $ | 2,460 |  | $ | 4,808 |
Supplemental Non-qualified Defined Benefit and Defined Contribution Plans | $ | 1,116 |  | $ | 1,116 |  | $ | 2,417 |

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