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DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
item
Dec. 31, 2012
Fair value of net derivatives    
Derivative Assets, Non-current $ 52  
Derivative Liabilities, current (99) (385)
Derivative Liabilities, Non-current   (567)
Derivative's Credit risk    
Number of counterparties to the commodity derivative contracts 2  
Commodity derivatives | Not designated as hedging instruments
   
Fair value of net derivatives    
Derivative Assets 52  
Derivative Liabilities (99) (952)
Commodity derivatives | Not designated as hedging instruments | Oil
   
Fair value of net derivatives    
Derivative Assets, Non-current 135  
Derivative Liabilities, current (180) 72
Derivative Liabilities, Non-current   (567)
Commodity derivatives | Not designated as hedging instruments | Natural Gas
   
Fair value of net derivatives    
Derivative Assets, Non-current (83)  
Derivative Liabilities, current $ 81 $ (457)