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RETIREMENT PLANS - Expected future service (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Pension Plans  
Estimated Pension Benefits  
2019 $ 5,022
2020 4,292
2021 4,452
2022 5,079
2023 4,355
2024 - 2028 23,534
Total 46,734
Postretirement Benefits  
Estimated Pension Benefits  
2019 277
2020 255
2021 237
2022 261
2023 236
2024 - 2028 1,535
Total $ 2,801