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Derivatives - Fair Value Amounts of Derivatives and Placement in Consolidated Balance Sheets (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Prepaid and other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral	$ 11,000	$ 200,000
Other long-term assets
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral	7,000,000	7,000,000
Commodity derivatives | Prepaid and other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	6,281,000	2,814,000
Commodity derivatives | Other accrued liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	0	(39,000)
J. Aron repurchase obligation derivative | Over the Counter | Obligations under Inventory Financing Agreements
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	(13,222,000)	(19,564,000)
Interest rate derivatives | Prepaid and other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	1,151,000	1,482,000
Interest rate derivatives | Other long-term assets
Derivative Instruments, Gain (Loss) [Line Items]
Asset (Liability)	$ 0	$ 2,328,000

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+ References

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- Definition

Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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