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BENEFIT PLANS - Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Pension Benefits [Member]  
Estimated Future Benefit Payments [Abstract]  
2021 $ 10,588
2022 11,061
2023 12,004
2024 12,404
2025 12,238
2026-2030 64,468
Post-retirement Benefits [Member]  
Estimated Future Benefit Payments [Abstract]  
2021 174
2022 130
2023 128
2024 125
2025 122
2026-2030 $ 560