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BENEFIT PLANS (Benefit Payments Which Reflect Expected Future Service, Expected to be Paid) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 58,857
2021 58,914
2022 60,476
2023 61,475
2025 62,138
2025-2029 303,663
Other Postretirement Benefit Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 5,340
2021 5,049
2022 4,669
2023 4,500
2025 4,257
2025-2029 $ 16,282