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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 (Details) - Commodity contracts - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative Assets and Liabilities Eligible for Offset, Net [Line Items]    
Net amounts of assets presented in the consolidated balance sheets $ 704 $ 11,402
Net amounts of liabilities presented in the consolidated balance sheets $ (1,002) $ (120)