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The average strike price on the group of price risk option contracts such as put options or call options.

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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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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Date derivative contract ends, in YYYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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Nominal volume used to calculate payments on a derivative instrument.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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Average fixed price related to the group of price risk swap derivatives.

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Fair value as of the balance sheet date of price risk derivative assets, net of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.