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BENEFIT PLANS (Benefit Payments Which Reflect Expected Future Service, Expected to be Paid) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 56,227
2019 57,099
2020 58,382
2021 59,356
2022 60,948
2023-2027 309,844
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 5,624
2019 5,431
2020 5,201
2021 4,859
2022 4,523
2023-2027 $ 17,359