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EMPLOYEE BENEFIT PLANS (Details 3) (PLC)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Pension Plan
     
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 4.07% 4.62%  
Rate of compensation increase (as a percent) 3.00%    
Expected long-term return on plan assets (as a percent) 7.50% 7.75%  
Period for which annualized returns are obtained for each asset class 25 years    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.62% 5.30% 5.57%
Expected long-term return on plan assets (as a percent) 7.75% 7.75% 8.00%
Defined Benefit Pension Plan | Minimum
     
Weighted-average assumptions used to determine benefit obligations      
Rate of compensation increase (as a percent)   2.50%  
Weighted-average assumptions used to determine net periodic benefit cost      
Rate of compensation increase (as a percent) 2.50% 2.50% 0.00%
Defined Benefit Pension Plan | Maximum
     
Weighted-average assumptions used to determine benefit obligations      
Rate of compensation increase (as a percent)   3.00%  
Weighted-average assumptions used to determine net periodic benefit cost      
Rate of compensation increase (as a percent) 3.00% 3.00% 3.75%
Unfunded Excess Benefits Plan
     
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 3.37% 4.07%  
Rate of compensation increase (as a percent) 4.00%    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.07% 4.79% 5.40%
Unfunded Excess Benefits Plan | Minimum
     
Weighted-average assumptions used to determine benefit obligations      
Rate of compensation increase (as a percent)   3.50%  
Weighted-average assumptions used to determine net periodic benefit cost      
Rate of compensation increase (as a percent) 3.50% 3.50% 0.00%
Unfunded Excess Benefits Plan | Maximum
     
Weighted-average assumptions used to determine benefit obligations      
Rate of compensation increase (as a percent)   4.00%  
Weighted-average assumptions used to determine net periodic benefit cost      
Rate of compensation increase (as a percent) 4.00% 4.00% 4.75%
Retiree medical plan
     
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 1.09%    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 1.97%    
Group life insurance plan
     
Weighted-average assumptions used to determine benefit obligations      
Discount rate (as a percent) 4.10%    
Expected long-term return on plan assets (as a percent) 3.26%    
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.62%    
Expected long-term return on plan assets (as a percent) 3.45%