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PENSION PLANS (Amortization of AOCI and Estimated Future Benefit Payments) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
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 net actuarial losses $ 1,100
Estimated future benefit payments  
2016 1,921
2017 1,856
2018 1,816
2019 1,775
2020 1,733
2021-2025 7,797
Total 16,898
SERPs  
Estimated amortization of components included in AOCI that will be recognized into net periodic cost for the next fiscal year  
Amortization of net transition obligation 17
Amortization of prior service cost 18
Amortization of net actuarial losses 51
Estimated future benefit payments  
2016 352
2017 348
2018 344
2019 335
2020 320
2021-2025 3,067
Total $ 4,766