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EMPLOYEE BENEFIT PLANS (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Jun. 30, 2013
Distributions and pension settlement expense          
Pension settlement expense, pre-tax $ 2,111 $ 0 $ 1,125    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost          
Total 17,044 86,737 88,393    
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year          
Period of estimate of future compensation rates used to establish the assumed rate of compensation increase 2 years        
Nonunion Defined Benefit Pension Plan
          
Employee Benefit Plans          
Defined Benefit Plan Lump Sum Distribution Paid 20,104        
Distributions and pension settlement expense          
Pension settlement distributions 22,486 17,226      
Pension settlement expense, pre-tax 2,111 0 0    
Pension settlement expense per diluted share, net of taxes $ 0.05 $ 0.00 $ 0.00    
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost          
Unrecognized net actuarial loss 16,003 82,337      
Total 16,003 82,337      
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year          
Unrecognized net actuarial loss 2,008        
Total 2,008        
Weighted-average assumptions used to determine nonunion benefit obligations          
Discount rate (as a percent) 3.80% 3.10%   3.70% 3.90%
Rate of compensation increase (as a percent)   3.30%      
Weighted-average assumptions used to determine net periodic benefit cost          
Discount rate (as a percent) 3.10% 3.70% 4.70%    
Expected return on plan assets (as a percent) 7.50% 7.50% 7.50%    
Rate of compensation increase (as a percent) 3.30% 3.30% 3.20%    
Expected return on plan assets expected to be utilized in determining pension plan expenses for next fiscal year (as a percent) 6.50%        
Estimated future benefit payments          
2014 22,396        
2015 20,628        
2016 19,792        
2017 18,785        
2018 17,187        
2018-2022 73,713        
Supplemental Benefit Plan
          
Distributions and pension settlement expense          
Pension settlement distributions 0 1,126 2,526    
Pension settlement expense, pre-tax 0 0 1,125    
Pension settlement expense per diluted share, net of taxes   $ 0.00 $ 0.03    
Period of delay provision for key employees as required by Section 409A of the Internal Revenue Code related to lump-sum termination payment 6 months        
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost          
Unrecognized net actuarial loss 1,778 2,308      
Total 1,778 2,308      
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year          
Unrecognized net actuarial loss 226        
Total 226        
Weighted-average assumptions used to determine nonunion benefit obligations          
Discount rate (as a percent) 2.80% 2.10%      
Weighted-average assumptions used to determine net periodic benefit cost          
Discount rate (as a percent) 2.10% 3.20% 4.10%    
Estimated future benefit payments          
2016 1,235        
2018-2022 7,042        
Postretirement Health Benefit Plan
          
Distributions and pension settlement expense          
Pension settlement distributions 588 586      
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost          
Unrecognized net actuarial loss 150 3,169      
Unrecognized prior service credit (887) (1,077)      
Total (737) 2,092      
Pre-tax amounts, which are reported within accumulated other comprehensive loss, expected to be recognized as components of net periodic benefit cost in next fiscal year          
Unrecognized net actuarial loss 17        
Unrecognized prior service credit (190)        
Total (173)        
Weighted-average assumptions used to determine nonunion benefit obligations          
Discount rate (as a percent) 4.70% 3.80%      
Weighted-average assumptions used to determine net periodic benefit cost          
Discount rate (as a percent) 3.80% 4.30% 5.40%    
Assumed health care cost trend rates          
Health care cost trend rate assumed for next year (as a percent) 8.00% 8.50%      
Health care cost trend rate assumed for next year, Post-65 (as a percent) 5.00%        
Rate to which the cost trend rate is assumed to decline (as a percent) 5.00% 5.00%      
Rate to which the cost trend rate is assumed to decline, Post-65 (as a percent) 5.00%        
Year that the rate reaches the cost trend assumed rate 2020 2020      
Year that the rate reaches the cost trend assumed rate, Post-65 2020        
Effects of one-percentage-point change in assumed health care cost trend rates          
Effect of one-percentage-point increase on total of service and interest cost components 220        
Effect of one-percentage-point decrease on total of service and interest cost components (174)        
Effect of one-percentage-point increase on postretirement benefit obligation 2,854        
Effect of one-percentage-point decrease on postretirement benefit obligation (2,330)        
Estimated future benefit payments          
2014 610        
2015 666        
2016 709        
2017 759        
2018 860        
2018-2022 $ 4,620