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Accounting for Derivative Instruments - Offsetting Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commodity Contract
Offsetting Assets [Line Items]
Gross Assets	$ 300	$ 4,189
Gross Amounts Offset	(171)	(3,973)
Net Assets	129	216
Cash Collateral Offset	0	0
Net Amount Presented	129	216
Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	300	3,876
Gross Amounts Offset	(171)	(3,660)
Net Assets	129	216
Cash Collateral Offset	0	0
Net Amount Presented	129	216
Non-trading Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	292	3,642
Gross Amounts Offset	(168)	(3,562)
Net Assets	124	80
Cash Collateral Offset	0	0
Net Amount Presented	124	80
Trading Commodity Contract, Current
Offsetting Assets [Line Items]
Gross Assets	8	234
Gross Amounts Offset	(3)	(98)
Net Assets	5	136
Cash Collateral Offset	0	0
Net Amount Presented	5	136
Commodity Contract, Noncurrent
Offsetting Assets [Line Items]
Gross Assets	0	313
Gross Amounts Offset	0	(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	0	313
Gross Amounts Offset	0	(313)
Net Assets	0	0
Cash Collateral Offset	0	0
Net Amount Presented	$ 0	$ 0

X

- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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