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Derivative Activities - Additional Information (Detail) | Jun. 30, 2018 USD ($) t_per_M MMBTU bbl
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Derivatives Excluding Basis Swaps and Freight Swaps |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (104,300,000)
Commodity | Basis Swaps | Natural Gas |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (1,900,000)
Volume Hedged | MMBTU | 68,805,000
Commodity | Basis Swaps | Propane |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ (2,100,000)
Commodity | Swaps | Freight | Level 2 |
Derivative [Line Items] |
Derivative assets liabilities at fair value net | $ 166,000
Volume Hedged | t_per_M | 5,000
2019 Commodity Contract | Basis Swaps | Propane |
Derivative [Line Items] |
Volume Hedged | bbl | 2,130,500

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: 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 + Details
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