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Accounting for Derivative Instruments - Offsetting Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Commodity Contract    
Offsetting Liabilities [Line Items]    
Gross Liabilities $ (18,880) $ (1,059)
Gross Amounts Offset 11,893 311
Net Liabilities (6,987) (748)
Cash Collateral Offset 300 0
Net Amount Presented (6,687) (748)
Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (11,035) (754)
Gross Amounts Offset 9,012 74
Net Liabilities (2,023) (680)
Cash Collateral Offset 300 0
Net Amount Presented (1,723) (680)
Trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (20) (92)
Gross Amounts Offset 0 5
Net Liabilities (20) (87)
Cash Collateral Offset 0 0
Net Amount Presented (20) (87)
Not Designated as Hedging Instrument | Non-trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (11,015) (662)
Gross Amounts Offset 9,012 69
Net Liabilities (2,003) (593)
Cash Collateral Offset 300 0
Net Amount Presented (1,703) (593)
Not Designated as Hedging Instrument | Trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (240)  
Gross Amounts Offset 116  
Net Liabilities (124)  
Cash Collateral Offset 0  
Net Amount Presented (124)  
Not Designated as Hedging Instrument | Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (7,845) (305)
Gross Amounts Offset 2,881 237
Net Liabilities (4,964) (68)
Cash Collateral Offset 0 0
Net Amount Presented (4,964) (68)
Not Designated as Hedging Instrument | Non-trading Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (7,605) (305)
Gross Amounts Offset 2,765 237
Net Liabilities (4,840) (68)
Cash Collateral Offset 0 0
Net Amount Presented $ (4,840) $ (68)