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Derivatives and Fair Value of Financial Instruments (Details 3) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2011 Commodity contracts | Dec. 31, 2010 Commodity contracts | Dec. 31, 2009 Commodity contracts | Dec. 31, 2010 Net commodity purchase contracts Grain bushel | Dec. 31, 2011 Net commodity purchase contracts Soybean oil pound | Dec. 31, 2011 Net commodity purchase contracts Soybean meal ton | Dec. 31, 2010 Net commodity purchase contracts Soybean meal ton | Dec. 31, 2011 Net commodity purchase contracts Hogs pound | Dec. 31, 2010 Net commodity purchase contracts Hogs pound | Dec. 31, 2011 Net commodity sale contracts Grain bushel | Dec. 31, 2011 Net commodity sale contracts Heating oil gallon | Dec. 31, 2010 Net commodity sale contracts Heating oil gallon | Dec. 31, 2011 Foreign currency exchange agreements | Dec. 31, 2010 Foreign currency exchange agreements | Dec. 31, 2011 Interest rate exchange agreements agreement | Dec. 31, 2010 Interest rate exchange agreements agreement | Aug. 28, 2010 Interest rate exchange agreements Y | May 29, 2010 Interest rate exchange agreements Y agreement
Derivative commodity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  | 5,880,000 | 2,580,000 | 23,300 | 2,900 | 2,280,000 | 43,240,000 | 10,599,000 | 1,176,000 | 1,806,000 |  |  |  |  |  |
Net realized and unrealized gains on derivatives | $ 20,279,000 | $ 8,047,000 | $ 7,047,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional amount |  |  |  |  |  |  |  |  |  |  |  |  | 158,266,000 | 183,042,000 | 100,000,000 | 100,000,000 |  |
Notional amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 | $ 25,000,000
Number of derivative agreements entered |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  | 3
Term of derivative contract (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Monetary amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Represents the term of the derivative contract entered into by the entity. + References No definition available. + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6935481&loc=SL5618551-113959 Reference 3: 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=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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