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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Pension Plans |  |  |  |  |
Components of the plan's net periodic pension cost |  |  |  |  |
Service cost | $ (164) | $ 447 | $ 682 | $ 1,342 |
Interest cost | 603 | 841 | 2,361 | 2,524 |
Expected return on plan assets | (414) | (1,263) | (2,730) | (3,790) |
Actuarial (gain)/ loss | (7) | 7 | (21) | 22 |
Net periodic pension expense | 18 | 32 | 292 | 98 |
Company contributions |  |  | 700 | 300 |
Funded status of plan |  |  |  |  |
Plan Net Assets |  |  |  |  | $ 15,100
Projected benefit obligation |  |  |  |  | $ 15,600
Postretirement Benefits |  |  |  |  |
Components of the plan's net periodic pension cost |  |  |  |  |
Service cost | 32 | 37 | 96 | 111 |
Interest cost | 45 | 40 | 135 | 120 |
Actuarial (gain)/ loss | (15) | (17) | (45) | (51) |
Net periodic pension expense | $ 62 | $ 60 | $ 186 | $ 180 |

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