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EMPLOYEE BENEFITS - Postretirement Benefits (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2013
USD ($)
Dec. 30, 2013
Dec. 31, 2015
USD ($)
years
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 30, 2015
Postretirement Benefits              
Expected return on assets         $ (0.0665) $ (0.0570)  
Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Annual Decrease 0.25% 0.25% 0.50%        
Decrease in Unrecognized Losses in AOCE       $ 51,000,000      
Postretirement Benefits              
Service cost       10,128,000 9,005,000 10,589,000  
Interest cost       9,649,000 10,549,000 8,938,000  
Expected return on assets       (10,375,000) (8,237,000) (7,076,000)  
Amortization of prior service credits       (6,801,000) (7,254,000) (7,412,000)  
Amortization of transition asset       0 (143,000) (143,000)  
Amortization of unrecognized losses       1,512,000 779,000 3,724,000  
Net periodic benefit costs       4,113,000 4,699,000 8,620,000  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]              
Benefit obligation at beginning of year       282,917,000 223,488,000    
Service cost       10,128,000 9,005,000 10,589,000  
Interest cost       9,649,000 10,549,000 8,938,000  
Plan participants' contributions       2,754,000 2,487,000    
Actuarial (gains) losses       (58,251,000) 42,300,000    
Benefits paid       (8,739,000) (5,609,000)    
Prescription Drug Rebates       890,000 702,000    
Medicare Part D Subsidy received       0 (5,000)    
Benefit obligation at end of year $ 239,348,000 $ 223,488,000   239,348,000 282,917,000 $ 223,488,000  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan participants' contributions       2,754,000 2,487,000    
Prescription Drug Rebates       890,000 702,000    
Benefits paid       (8,739,000) (5,609,000)    
Noncurrent postretirement benefit obligation 83,737,000     83,737,000 126,902,000    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]              
Prior service credit (cost) 60,502,000     60,502,000 67,303,000    
Unrecognized losses (3,015,000)     (3,015,000) (54,034,000)    
Deferred tax (liability) asset (22,134,000)     (22,134,000) (5,121,000)    
Net losses $ 35,353,000     35,353,000 $ 8,148,000    
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]              
Amortization of prior service credit       (6,688,000)      
Amortization of unrecognized losses       207,000      
Estimated amount to be amortized from AOCE into net periodic postretirement benefit costs       $ (6,481,000)      
Net Unrecognized Losses Amortization Period | years       14.6      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]              
Discount rate       3.89% 4.90% 4.00%  
Expected long-term rate of return on plan assets, net of tax       6.65% 5.70% 6.00%  
Initial healthcare cost trend rate       7.25% 7.50% 8.00%  
Ultimate healthcare cost trend rate       4.50% 4.50% 5.00%  
Year ultimate healthcare cost trend rate reached 2026 2019   2026 2026 2019  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]              
Discount rate 4.20% 4.90%   4.20% 3.89% 4.90% 3.89%
Expected long-term rate of return on plan assets, net of tax 6.65% 5.70%   6.65% 6.65% 5.70%  
Initial healthcare cost trend rate 7.00% 7.50%   7.00% 7.25% 7.50%  
Ultimate healthcare cost trend rate 4.50% 4.50%   4.50% 4.50% 4.50%  
Year ultimate healthcare cost trend rate reached       2026 2026 2026  
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]              
Effect of one percentage point increase on service and interest cost       $ 2,071,000      
Effect of one percentage point decrease on service and interest cost       (1,667,000)      
Effect of one percentage point increase on postretirement benefit obligation       28,450,000      
Effect of one percentage point decrease on postretirement benefit obligation       (23,280,000)      
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]              
Estimated gross benefit payments, 2016 $ 6,405,000     6,405,000      
Estimated gross benefit payments, 2017 7,269,000     7,269,000      
Estimated gross benefit payments, 2018 8,259,000     8,259,000      
Estimated gross benefit payments, 2019 9,330,000     9,330,000      
Estimated gross benefit payments, 2020 10,502,000     10,502,000      
Estimated gross benefit payments, 2021-2025 69,724,000     69,724,000      
Plan Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]              
Plan participants' contributions       2,754,000 $ 2,487,000    
Benefits paid       (8,430,000) (5,609,000)    
Prescription Drug Rebates       890,000 702,000    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan assets available for benefits at beginning of year       156,015,000 144,514,000    
Actual returns (losses) on plan assets       1,635,000 13,730,000    
Employer's contributions       2,747,000 191,000    
Plan participants' contributions       2,754,000 2,487,000    
Prescription Drug Rebates       890,000 702,000    
Benefits paid       (8,430,000) (5,609,000)    
Plan assets available for benefits at end of year 155,611,000 $ 144,514,000   155,611,000 156,015,000 $ 144,514,000  
Fidelity Spartan Us Equity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan assets available for benefits at beginning of year       73,071,000      
Plan assets available for benefits at end of year 70,973,000     70,973,000 73,071,000    
Vanguard 500 Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan assets available for benefits at beginning of year       77,202,000      
Plan assets available for benefits at end of year 78,254,000     78,254,000 77,202,000    
Vanguard Total International Stock Member | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan assets available for benefits at beginning of year       23,994,000      
Plan assets available for benefits at end of year 22,976,000     22,976,000 23,994,000    
Total Registered Investment Companies [Member] | Fair Value, Inputs, Level 1 [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]              
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]              
Plan assets available for benefits at beginning of year       174,267,000      
Plan assets available for benefits at end of year $ 172,203,000     $ 172,203,000 $ 174,267,000