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Accounting for Derivative Instruments - Offsetting Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Commodity Contract    
Offsetting Liabilities [Line Items]    
Gross Liabilities $ (1,059) $ (14,888)
Gross Amounts Offset 311 3,550
Net Liabilities (748) (11,338)
Cash Collateral Offset 0 100
Net Amount Presented (748) (11,238)
Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (754) (13,938)
Gross Amounts Offset 74 3,218
Net Liabilities (680) (10,720)
Cash Collateral Offset 0 100
Net Amount Presented (680) (10,620)
Non-trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (662) (13,618)
Gross Amounts Offset 69 3,151
Net Liabilities (593) (10,467)
Cash Collateral Offset 100
Net Amount Presented (593) (10,367)
Trading Commodity Contract, Current    
Offsetting Liabilities [Line Items]    
Gross Liabilities (92) (320)
Gross Amounts Offset 5 67
Net Liabilities (87) (253)
Cash Collateral Offset 0 0
Net Amount Presented (87) (253)
Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (305) (950)
Gross Amounts Offset 237 332
Net Liabilities (68) (618)
Cash Collateral Offset 0 0
Net Amount Presented (68) (618)
Non-trading Commodity Contract, Noncurrent    
Offsetting Liabilities [Line Items]    
Gross Liabilities (305) (950)
Gross Amounts Offset 237 332
Net Liabilities (68) (618)
Cash Collateral Offset 0 0
Net Amount Presented $ (68) $ (618)