Derivative Instruments (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 45,000,000invest_DerivativeNotionalAmount
Less: Counterparty netting and cash collateral	61,000	0
Less: Counterparty netting and cash collateral	61,000	0
Total net fair value of derivatives	419,000	116,000
Total net fair value of derivatives	0	0
Cash collateral	0	0
Gain (Loss) Recognized in Income	2,991,000	(720,000)	85,000
Derivatives not designated as hedging instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Assets	480,000	116,000
Liabilities	(61,000)	0
Open derivative contracts (barrels)	142,000
Other long term assets \| Derivatives not designated as hedging instrument [Member] \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Assets	24,000	116,000
Derivative Asset, Fair Value, Gross Liability	0	0
Other current assets \| Derivatives not designated as hedging instrument [Member] \| Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Assets	456,000	0
Derivative Asset, Fair Value, Gross Liability	(61,000)	0
Interest expense \| Derivatives not designated as hedging instrument [Member] \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	(92,000)	(106,000)	0
Cost of goods sold \| Derivatives not designated as hedging instrument [Member] \| Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income	$ 3,083,000	$ (614,000)	$ 85,000

Derivative Asset, Counterparty Netting and Cash Collateral

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- Definition

Derivative Liability, Counterparty Netting and Cash Collateral

+ References

No definition available.

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 8

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-Topic 210

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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.

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-Publisher FASB

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-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

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Fair value of 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Topic 210

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-Paragraph 3

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Fair value before effects of master netting arrangements, of a 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.

+ References

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Fair value 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 offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Paragraph 4A

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