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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s defined benefit plans were as follows (in thousands):
|  | Pension Benefits |
|  | Pension Plans |  |  | SERP |
|  | Three months ended June 30, |  |  | Three months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2,053 |  |  | $ | 1,919 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 3,535 |  |  |  | 3,949 |  |  |  | 7 |  |  |  | 10 |
Expected return on plan assets |  |  | (6,559 | ) |  |  | (5,735 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | 790 |  |  |  | 425 |  |  |  | 10 |  |  |  | 9 |
Net periodic benefit cost |  | $ | (181 | ) |  | $ | 558 |  |  | $ | 17 |  |  | $ | 19 |
|  | Pension Benefits |
|  | Pension Plans |  |  | SERP |
|  | Six months ended June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 3,980 |  |  | $ | 3,836 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 7,119 |  |  |  | 7,839 |  |  |  | 15 |  |  |  | 20 |
Expected return on plan assets |  |  | (13,133 | ) |  |  | (11,923 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | 1,888 |  |  |  | 657 |  |  |  | 20 |  |  |  | 18 |
Net periodic benefit cost |  | $ | (146 | ) |  | $ | 409 |  |  | $ | 35 |  |  | $ | 38 |
Other Postretirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s postretirement benefit plan were as follows (in thousands):
|  | Other Postretirement Benefits |
|  | Postretirement Welfare Plan |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4 |  |  |  | 5 |  |  |  | 8 |  |  |  | 11 |
Amortization of actuarial gain |  |  | (112 | ) |  |  | (130 | ) |  |  | (225 | ) |  |  | (261 | )
Net periodic benefit cost |  | $ | (108 | ) |  | $ | (125 | ) |  | $ | (217 | ) |  | $ | (250 | )

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