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Derivative Instruments - Balance Sheet Location (Details)
$ in Thousands

Mar. 31, 2019

USD ($)

bbl

Dec. 31, 2018

USD ($)

bbl

Footnote [Abstract]

Cash collateral

$ 300

$ 400

Derivatives not designated as hedging instrument [Member]

Derivatives, Fair Value [Line Items]

Assets

61

186

Liabilities

(87)

(2)

Less: Counterparty netting and cash collateral (deficit), assets

^[1]

(183)

(404)

Less: Counterparty netting and cash collateral (deficit), liabilities

^[1]

(87)

(2)

Total net fair value of derivative, assets

244

590

Total net fair value of derivative, liabilities

$ 0

$ 0

Footnote [Abstract]

Derivative open contracts (in barrels) | bbl

68,000

82,000

Derivatives not designated as hedging instrument [Member] | Commodity derivatives | Other current assets

Derivatives, Fair Value [Line Items]

Assets

^[2]

$ 61

$ 186

Liabilities

^[2]

$ (87)

$ (2)

[1]	As of March 31, 2019 and December 31, 2018, we had a cash collateral of $0.3 million and $0.4 million, respectively, netted with the net derivative position of our counterparty.
[2]	As of March 31, 2019 and December 31, 2018, we had open derivative contracts representing 68,000 barrels and 82,000 barrels, respectively, of refined petroleum products.

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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
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