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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 (Details) - Commodity contracts - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Offsetting Assets [Line Items]    
Net amounts of assets presented in the consolidated balance sheets $ 11,402 $ 16,362
Net amounts of liabilities presented in the consolidated balance sheets $ (120) $ (4,623)