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EMPLOYEE BENEFIT PLANS (Future benefit payments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jan. 01, 2017
Nonunion Defined Benefit Pension Plan    
Estimated future benefit payments    
2018 $ 22,511  
2019 11,244  
2020 12,051  
2021 10,843  
2022 11,029  
2023-2027 46,448  
Required minimum contributions    
Adjusted funding target attainment percentage   107.80%
Estimated cash contribution for 2018 10,000  
Supplemental Benefit Plan    
Estimated future benefit payments    
2019 3,107  
2023-2027 718  
Postretirement Health Benefit Plan    
Estimated future benefit payments    
2018 753  
2019 827  
2020 879  
2021 952  
2022 1,013  
2023-2027 $ 5,949