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BENEFIT PLANS (Details) - Pension Benefits - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Plans |  |  |  |  |  |
Contribution made to defined benefit pension plan by employer |  | $ 4,300 |  | $ 100 |  |
Net periodic benefit cost |  |  |  |  |  |
Service cost | $ 1,108 |  | $ 1,240 |  | $ 3,324 | $ 3,720
Interest cost | 1,890 |  | 1,334 |  | 5,670 | 4,002
Expected return on plan assets | (4,020) |  | (4,756) |  | (12,060) | (14,268)
Amortization of unrecognized net (gain) loss | (555) |  | 211 |  | (1,665) | 633
Amortization of prior service cost | 205 |  | 154 |  | 615 | 462
Net periodic benefit | $ (1,372) |  | $ (1,817) |  | $ (4,116) | $ (5,451)

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