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Accounting for Derivative Instruments - Offsetting Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Commodity Contract    
Offsetting Assets [Line Items]    
Gross Assets $ 300 $ 4,189
Gross Amounts Offset (171) (3,973)
Net Assets 129 216
Cash Collateral Offset 0 0
Net Amount Presented 129 216
Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 300 3,876
Gross Amounts Offset (171) (3,660)
Net Assets 129 216
Cash Collateral Offset 0 0
Net Amount Presented 129 216
Non-trading Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 292 3,642
Gross Amounts Offset (168) (3,562)
Net Assets 124 80
Cash Collateral Offset 0 0
Net Amount Presented 124 80
Trading Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 8 234
Gross Amounts Offset (3) (98)
Net Assets 5 136
Cash Collateral Offset 0 0
Net Amount Presented 5 136
Commodity Contract, Noncurrent    
Offsetting Assets [Line Items]    
Gross Assets 0 313
Gross Amounts Offset 0 (313)
Net Assets 0 0
Cash Collateral Offset 0 0
Net Amount Presented 0 0
Non-trading Commodity Contract, Noncurrent    
Offsetting Assets [Line Items]    
Gross Assets 0 313
Gross Amounts Offset 0 (313)
Net Assets 0 0
Cash Collateral Offset 0 0
Net Amount Presented $ 0 $ 0