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RETIREMENT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2019
Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Benefit Cost | The components of net periodic benefit cost for the Company’s defined benefit plans for the three months and nine months ended September 30, 2019 and 2018 were as follows (in thousands):
|  | Pension Benefits |
|  | Pension Plan |  |  | SERP |
|  | Three months ended September 30, |  |  | Three months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,841 |  |  | $ | 1,722 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 4,123 |  |  |  | 3,939 |  |  |  | 13 |  |  |  | 12 |
Expected return on plan assets |  |  | (5,239 | ) |  |  | (5,696 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | 359 |  |  |  | 723 |  |  |  | 7 |  |  |  | 6 |
Net periodic benefit cost |  | $ | 1,084 |  |  | $ | 688 |  |  | $ | 20 |  |  | $ | 18 |
|  | Pension Benefits |
|  | Pension Plan |  |  | SERP |
|  | Nine months ended September 30, |  |  | Nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 5,523 |  |  | $ | 5,816 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 12,370 |  |  |  | 11,544 |  |  |  | 39 |  |  |  | 36 |
Expected return on plan assets |  |  | (15,717 | ) |  |  | (16,712 | ) |  |  | — |  |  |  | — |
Amortization of actuarial loss |  |  | 1,078 |  |  |  | 2,168 |  |  |  | 21 |  |  |  | 18 |
Net periodic benefit cost |  | $ | 3,254 |  |  | $ | 2,816 |  |  | $ | 60 |  |  | $ | 54 |
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 for the three months and nine months ended September 30, 2019 and 2018 were as follows (in thousands):
|  | Other Postretirement Benefits |
|  | Postretirement Welfare Plan |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 7 |  |  |  | 6 |  |  |  | 23 |  |  |  | 18 |
Amortization of actuarial gain |  |  | (135 | ) |  |  | (149 | ) |  |  | (405 | ) |  |  | (447 | )
Net periodic benefit cost |  | $ | (128 | ) |  | $ | (143 | ) |  | $ | (382 | ) |  | $ | (429 | )

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