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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Pension |  |  |  |
Employee benefits |  |  |  |
Service cost | $ 757 | $ 969 | $ 1,387 | $ 1,815
Interest cost | 2,875 | 2,656 | 5,750 | 5,489
Expected return on plan assets | (3,235) | (4,012) | (6,470) | (7,889)
Amortization of prior service cost (credit) | 91 | (90) | 182 | (271)
Amortization of net loss | 488 | 886 | 977 | 1,531
Net periodic cost | 976 | 409 | 1,826 | 675
Other Postretirement Benefits Plan |  |  |  |
Employee benefits |  |  |  |
Net periodic cost | $ 0 | $ 0 | $ 0 | $ 0

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