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BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Plans [Abstract] |  |  |  |  |
Contribution made to defined benefit pension plan by employer |  |  | $ 3,900 |  |
Pension Benefits [Member] |  |  |  |  |
Pension Plans [Abstract] |  |  |  |  |
Contribution made to defined benefit pension plan by employer |  | $ 2,900 |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | $ 1,480 |  | 1,438 | $ 4,440 | $ 4,313
Interest cost | 1,259 |  | 1,356 | 3,777 | 4,068
Expected return on plan assets | (4,696) |  | (3,932) | (14,087) | (11,796)
Amortization of unrecognized net loss | 900 |  | 810 | 2,700 | 2,430
Amortization of prior service cost | 95 |  | 60 | 284 | 180
Net periodic benefit | (962) |  | (268) | (2,886) | (805)
Post-retirement Benefits [Member] |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 0 |  | 0 | 0 | 0
Interest cost | 11 |  | 15 | 33 | 43
Expected return on plan assets | 0 |  | 0 | 0 | 0
Amortization of unrecognized net loss | 11 |  | 10 | 33 | 30
Amortization of prior service cost | (45) |  | (45) | (134) | (134)
Net periodic benefit | $ (23) |  | $ (20) | $ (68) | $ (61)

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