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EMPLOYEE BENEFIT PLANS - Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Defined Benefit Pension Plan  
Estimated future benefit payments under defined benefit pension plan  
2016 $ 16,947
2017 18,019
2018 17,723
2019 18,517
2020 19,532
2021-2025 102,176
Unfunded Excess Benefit Plan  
Estimated future benefit payments under defined benefit pension plan  
2016 5,470
2017 7,682
2018 5,070
2019 9,097
2020 4,962
2021-2025 $ 18,888