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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]
Dec. 31, 2015
Dec. 31, 2014
Assets [Member] | Inventories Component [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 10.00% 23.40%
Transportation cost 1.80% 4.90%
Assets [Member] | Commodity Derivative Contracts [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 17.70% 13.50%
Transportation cost 6.60% 10.20%
Liabilities [Member] | Inventories Component [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 53.50% 43.40%
Transportation cost 0.00% 15.20%
Liabilities [Member] | Commodity Derivative Contracts [Member]    
Unobservable inputs in Level 3 Valuations of Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items]    
Basis 17.90% 13.60%
Transportation cost 10.40% 19.50%