$ 8,144

$ 11,672

(2,833)

(7,686)

5,311

3,986

Liability Derivatives [Abstracts]

5,055

10,806

(2,833)

(7,686)

Commodity-Related Derivatives [Member]

2,222

3,120

Asset Derivatives [Abstracts]

7,030

9,533

(1,719)

(5,547)

5,311

3,986

Liability Derivatives [Abstracts]

2,589

7,127

(1,719)

(5,547)

Interest Rate Swaps [Member]

870

1,580

Asset Derivatives [Abstracts]

1,114

2,139

(1,114)

(2,139)

Liability Derivatives [Abstracts]

2,466

3,679

(1,114)

(2,139)

$ 1,352

$ 1,540

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226003-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Fair value, after offset of derivative asset, of financial liability or 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or 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.