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RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Pension Plans |  |  |  |  |
Components of the plan's net periodic pension cost |  |  |  |  |
Service cost | $ 423 | $ 447 | $ 846 | $ 895 |
Interest cost | 879 | 841 | 1,758 | 1,682 |
Expected return on plan assets | (1,158) | (1,263) | (2,316) | (2,527) |
Actuarial (gain)/ loss | (7) | 7 | (14) | 15 |
Net periodic pension expense | 137 | 32 | 274 | 65 |
Company contributions |  |  | 700 |  |
Funded status of plan |  |  |  |  |
Plan Net Assets |  |  |  |  | $ 15,600
Projected benefit obligation |  |  |  |  | $ 15,100
Postretirement Benefits |  |  |  |  |
Components of the plan's net periodic pension cost |  |  |  |  |
Service cost | 32 | 37 | 64 | 74 |
Interest cost | 45 | 40 | 90 | 80 |
Actuarial (gain)/ loss | (15) | (17) | (30) | (34) |
Net periodic pension expense | $ 62 | $ 60 | $ 124 | $ 120 |

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