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PENSION PLANS AND OTHER POST-RETIREMENT BENEFITS - Assumptions Used to Calculate Net Periodic Cost and Benefit Obligations (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Assumptions used to calculate benefit obligations [Abstract]      
Weighted average rate of future compensation increase 2.92%    
Pension Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Weighted average discount rate   3.63% 4.52%
Expected long-term rate of return on plan assets   7.00% 7.00%
Weighted average rate of future compensation increase 2.92% 3.71% 3.59%
Assumptions used to calculate benefit obligations [Abstract]      
Weighted average discount rate   4.30%  
Weighted average rate of future compensation increase   3.60%  
Postretirement Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Weighted average discount rate 4.25% 4.26% 4.95%
Expected long-term rate of return on plan assets   7.00% 7.00%
Assumptions used to calculate benefit obligations [Abstract]      
Weighted average discount rate 4.40% 5.00%  
Minimum | Pension Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Weighted average discount rate 4.00%    
Expected long-term rate of return on plan assets 7.00%    
Minimum | Postretirement Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Expected long-term rate of return on plan assets 4.75%    
Assumptions used to calculate benefit obligations [Abstract]      
Weighted average discount rate 4.15%    
Maximum | Pension Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Weighted average discount rate 4.05%    
Expected long-term rate of return on plan assets 7.25%    
Maximum | Postretirement Plans
     
Assumptions used to calculate net periodic cost [Abstract]      
Expected long-term rate of return on plan assets 7.25%    
Assumptions used to calculate benefit obligations [Abstract]      
Weighted average discount rate 4.25%