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BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension Plans |  |  |  |  |
Contribution made to defined benefit pension plan by employer | $ 4,300 |  |  |  |
Pension Benefits |  |  |  |  |
Pension Plans |  |  |  |  |
Contribution made to defined benefit pension plan by employer |  |  | $ 100 |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 1,108 | $ 1,240 |  | $ 2,216 | $ 2,480
Interest cost | 1,890 | 1,334 |  | 3,780 | 2,668
Expected return on plan assets | (4,020) | (4,756) |  | (8,040) | (9,512)
Amortization of unrecognized net (gain) loss | (555) | 211 |  | (1,110) | 422
Amortization of prior service cost | 205 | 154 |  | 410 | 308
Net periodic benefit | $ (1,372) | $ (1,817) |  | $ (2,744) | $ (3,634)

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