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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 (Details) (Commodity contracts, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Commodity contracts
   
Derivative Assets and Liabilities Eligible for Offset, Net [Line Items]    
Net amounts of assets presented in the consolidated balance sheets $ 6,068 $ 11,925
Net amounts of liabilities presented in the consolidated balance sheets $ (2,985) $ (3,808)