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PENSION PLANS (Amortization of AOCI and Estimated Future Benefit Payments) (Details)
$ in Thousands
Dec. 31, 2017
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 $ 1,000
Estimated future benefit payments  
2016 1,852
2017 1,819
2018 1,777
2019 1,737
2020 1,672
2021-2025 7,460
Total 16,317
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 102
Amortization of net transition obligation 18
Amortization of prior service cost 18
Estimated future benefit payments  
2016 351
2017 347
2018 340
2019 325
2020 316
2021-2025 3,212
Total $ 4,891