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Derivative Instruments Income Statement Location (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commodity derivatives | Purchases from Affiliates | Derivatives not designated as hedging instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, gain (loss) on derivative, net | $ 3,325 | $ (1,550) | $ (2,122)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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