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Derivatives - Schedule of Pre-Tax Gain (Loss) Recognized in the Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Commodity derivatives | Cost of revenues (excluding depreciation) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gains (losses) | $ (1,247) | $ 2,736 | $ 3,685 | $ (3,631)
J. Aron repurchase obligation derivative | Cost of revenues (excluding depreciation) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gains (losses) | 8,800 | 8,439 | 15,142 | 19,046
Interest rate derivatives | Interest expense and financing costs, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gains (losses) | $ 62 | $ (735) | $ 1,298 | $ (625)

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition 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. + References No definition available. + Details
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