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Accounting for Derivative Instruments - Offsetting Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commodity Contract
Offsetting Assets [Line Items]
Gross Assets	$ 28,145	$ 1,000
Gross Amounts Offset	(16,718)	(395)
Net Assets	11,427	605
Cash Collateral Offset	0	0
Net Amount Presented	11,427	605
Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	20,271	1,000
Gross Amounts Offset	(11,927)	(395)
Net Assets	8,344	605
Cash Collateral Offset	0	0
Net Amount Presented	8,344	605
Non-trading Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	19,657	589
Gross Amounts Offset	(11,844)	(389)
Net Assets	7,813	200
Cash Collateral Offset	0	0
Net Amount Presented	7,813	200
Trading Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	614	411
Gross Amounts Offset	(83)	(6)
Net Assets	531	405
Cash Collateral Offset	0	0
Net Amount Presented	531	405
Commodity Contract, Noncurrent
Offsetting Assets [Line Items]
Gross Assets	7,874	0
Gross Amounts Offset	(4,791)	0
Net Assets	3,083	0
Cash Collateral Offset	0	0
Net Amount Presented	3,083	0
Non-trading Commodity Contract, Noncurrent
Offsetting Assets [Line Items]
Gross Assets	7,874	0
Gross Amounts Offset	(4,791)	0
Net Assets	3,083	0
Cash Collateral Offset	0	0
Net Amount Presented	$ 3,083	$ 0

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