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Fair Value Measurements (Unobservable Inputs In Level 3 Valuations Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Weighted Average [Member] - Significant Unobservable Inputs (Level 3) [Member] - Fair Value, Measurements, Recurring [Member]
Sep. 30, 2015
Dec. 31, 2014
Inventory Related Payables [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 45.70% 43.40%
Transportation cost 0.00% 15.20%
Commodity Derivative Contracts Losses [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 17.50% 13.60%
Transportation cost 26.30% 19.50%
Inventories Carried At Market [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 21.20% 23.40%
Transportation cost 4.00% 4.90%
Commodity Derivative Contracts Gains [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 12.50% 13.50%
Transportation cost 9.90% 10.20%