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Accounting for Derivative Instruments - Offsetting Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Commodity Contract    
Offsetting Liabilities [Line Items]    
Gross Liabilities $ (13,661) $ (15,977)
Gross Amounts Offset 6,351 3,973
Net Liabilities (7,310) (12,004)
Cash Collateral Offset 0 0
Net Amount Presented (7,310) (12,004)
Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (12,315) (15,186)
Gross Amounts Offset 5,877 3,660
Net Liabilities (6,437) (11,526)
Cash Collateral Offset 0 0
Net Amount Presented (6,437) (11,526)
Non-trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (12,239) (14,911)
Gross Amounts Offset 5,845 3,562
Net Liabilities (6,393) (11,349)
Cash Collateral Offset 0 0
Net Amount Presented (6,393) (11,349)
Trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (76) (275)
Gross Amounts Offset 32 98
Net Liabilities (44) (177)
Cash Collateral Offset 0 0
Net Amount Presented (44) (177)
Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (1,346) (791)
Gross Amounts Offset 474 313
Net Liabilities (873) (478)
Cash Collateral Offset 0 0
Net Amount Presented (873) (478)
Non-trading Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (1,346) (791)
Gross Amounts Offset 474 313
Net Liabilities (873) (478)
Cash Collateral Offset 0 0
Net Amount Presented $ (873) $ (478)