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EMPLOYEE BENEFIT PLANS (Details)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
EMPLOYEE BENEFIT PLANS        
Single Employer Defined Benefit Plan Funded Number 2      
Employee benefit plans        
Target allocation (as a percent) 100.00%      
Weighted-average asset allocations (as a percent) 100.00% 100.00%    
Pension Benefits
        
Employee benefit plans        
One year returns (losses) on plan assets (as a percent) 15.20%      
Three year returns (losses) on plan assets (as a percent) 8.40%      
Five year returns (losses) on plan assets (as a percent) (0.10%)      
Long-term average return on plan assets since inception (as a percent) 8.30%      
Expected long-term rate of return plan assets (as a percent) 8.30% 8.30% 8.30% 8.50%
Pension Benefits | Domestic equity securities
        
Employee benefit plans        
Target allocation (as a percent) 53.00%      
Weighted-average asset allocations (as a percent) 56.00% 59.00%    
Pension Benefits | International equity securities
        
Employee benefit plans        
Target allocation (as a percent) 15.00%      
Weighted-average asset allocations (as a percent) 14.00% 14.00%    
Pension Benefits | Debt securities
        
Employee benefit plans        
Target allocation (as a percent) 22.00%      
Weighted-average asset allocations (as a percent) 19.00% 17.00%    
Pension Benefits | Real estate
        
Employee benefit plans        
Target allocation (as a percent) 10.00%      
Weighted-average asset allocations (as a percent) 5.00% 6.00%    
Pension Benefits | Other and cash
        
Employee benefit plans        
Weighted-average asset allocations (as a percent) 6.00% 4.00%