v2.4.0.8
DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 2 (Details) (Commodity contracts, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Commodity contracts
   
Offsetting Assets [Line Items]    
Net amounts of assets presented in the consolidated balance sheets $ 11,925 $ 18,564
Net amounts of liabilities presented in the consolidated balance sheets $ (3,808) $ (19,210)