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Derivative Instruments and Hedging Activities Additional Information (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Commodity contracts | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Gain (loss) on sale of derivatives | $ (121,000) | $ (1,053,000)
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Gain (loss) on sale of derivatives | $ (7,185,000) | $ 1,572,000

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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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