Derivative Instruments - Balance Sheet Location (Details) $ in Thousands	Mar. 31, 2018 USD ($) bbl	Dec. 31, 2017 USD ($) bbl
Footnote [Abstract]
Cash deficit	$ 200
Cash collateral		$ 300
Derivatives not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Assets	13	0
Liabilities	(167)	(1,087)
Less: Counterparty netting and cash collateral	(209)	290
Less: Counterparty netting and cash collateral	(13)	0
Total net fair value of derivative, assets	0	0
Total net fair value of derivative, liabilities	$ (376)	$ (797)
Footnote [Abstract]
Derivative open contracts (in barrels) \| bbl	189,000	370,000
Derivatives not designated as hedging instrument [Member] \| Commodity derivatives \| Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Assets	$ 13	$ 0
Liabilities	$ (167)	$ (1,087)

Derivative Asset Counterparty Netting and Cash Collateral

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Derivative Liability Counterparty Netting and Cash Collateral

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Footnote [Abstract]

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

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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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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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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.

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

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Fair value, after effects of master netting arrangements, 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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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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