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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 2 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
MMcf
Dec. 31, 2012
MMcf
Derivative [Line Items]    
Derivative, Net Liability Position, Aggregate Fair Value $ 1.1  
Fixed Price [Member] | Natural Gas [Member] | Cash Flow Hedging [Member] | Sold [Member] | Exchange Futures [Member]
   
Derivative [Line Items]    
Notional amount (48,100.0) (31,700.0)
Fixed Price [Member] | Natural Gas [Member] | Cash Flow Hedging [Member] | Purchased [Member] | Exchange Futures [Member]
   
Derivative [Line Items]    
Notional amount 0 0
Fixed Price [Member] | Crude oil and NGLs [Member] | Cash Flow Hedging [Member] | Sold [Member] | Swaps [Member]
   
Derivative [Line Items]    
Notional amount (4.0) (1.1)
Fixed Price [Member] | Crude oil and NGLs [Member] | Cash Flow Hedging [Member] | Purchased [Member] | Swaps [Member]
   
Derivative [Line Items]    
Notional amount 0 0
Basis [Member] | Natural Gas [Member] | Cash Flow Hedging [Member] | Sold [Member] | Forward and Swaps Contracts [Member]
   
Derivative [Line Items]    
Notional amount (48,100.0) (31,700.0)
Basis [Member] | Natural Gas [Member] | Cash Flow Hedging [Member] | Purchased [Member] | Forward and Swaps Contracts [Member]
   
Derivative [Line Items]    
Notional amount 0 0
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Sold [Member] | Forward Starting Contracts [Member]
   
Derivative [Line Items]    
Derivative, Notional Amount 0 0
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Purchased [Member] | Forward Starting Contracts [Member]
   
Derivative [Line Items]    
Derivative, Notional Amount $ 400.0 $ 400.0