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PENSION PLANS (Amortization of AOCI and Estimated Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Pension Plan  
Estimated amortization of components included in AOCI that will be recognized into net periodic cost for the next fiscal year  
Amortization of prior service cost $ 800
Estimated future benefit payments  
2016 1,769
2017 1,718
2018 1,652
2019 1,606
2020 1,541
2021-2025 6,617
Total 14,903
SERPs  
Estimated amortization of components included in AOCI that will be recognized into net periodic cost for the next fiscal year  
Amortization of net actuarial losses 16
Amortization of net transition obligation 18
Amortization of prior service cost 18
Estimated future benefit payments  
2016 329
2017 320
2018 490
2019 661
2020 653
2021-2025 4,051
Total $ 6,504