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Accounting for Derivative Instruments - Offsetting Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Commodity Contract    
Offsetting Assets [Line Items]    
Gross Assets $ 2,876 $ 4,189
Gross Amounts Offset (1,952) (3,973)
Net Assets 924 216
Cash Collateral Offset 0 0
Net Amount Presented 924 216
Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 2,476 3,876
Gross Amounts Offset (1,552) (3,660)
Net Assets 924 216
Cash Collateral Offset 0 0
Net Amount Presented 924 216
Non-trading Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 2,370 3,642
Gross Amounts Offset (1,478) (3,562)
Net Assets 892 80
Cash Collateral Offset 0 0
Net Amount Presented 892 80
Trading Commodity Contract, Current    
Offsetting Assets [Line Items]    
Gross Assets 106 234
Gross Amounts Offset (74) (98)
Net Assets 32 136
Cash Collateral Offset 0 0
Net Amount Presented 32 136
Commodity Contract, Noncurrent    
Offsetting Assets [Line Items]    
Gross Assets 400 313
Gross Amounts Offset (400) (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 400 313
Gross Amounts Offset (400) (313)
Net Assets 0 0
Cash Collateral Offset 0 0
Net Amount Presented $ 0 $ 0