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Derivatives and Fair Value of Financial Instruments (Details 3) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 29, 2012 agreement | May 29, 2010 agreement | Aug. 28, 2010
Commodities |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivatives | $ 18,355,000 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (17,016,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (6,098,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |  |
Net commodity purchase contracts | Sugar |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 15,551,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_SugarContractMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 51,184,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_SugarContractMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |
Net commodity purchase contracts | Hogs |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 19,800,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_HogsMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 32,440,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_HogsMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |
Net commodity purchase contracts | Grain |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 10,697,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_GrainMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 6,540,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_GrainMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |
Net commodity purchase contracts | Cheese |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount |  | 440,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_CheeseMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |
Net commodity purchase contracts | Dry whey powder |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 88,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_WheyPowderMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 308,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_WheyPowderMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |
Net commodity purchase contracts | Soybean meal |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 85,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_SoybeanMealMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |  |
Net commodity purchase contracts | Soybean oil |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 19,620,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_SoybeanOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |  |  |
Net commodity sale contracts | Palm oil |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount |  | 12,125,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_PalmOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommoditySaleContractMember |  |  |  |
Net commodity sale contracts | Soybean meal |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount |  | 76,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = seb_SoybeanMealMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommoditySaleContractMember |  |  |  |
Net commodity sale contracts | Heating oil |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Nonmonetary notional amount | 4,326,000 invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_HeatingOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommoditySaleContractMember |  |  |  |  |
Foreign currencies |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Notional amounts | 143,961,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | 127,389,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |  |  |
Interest rate swaps |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Notional amounts | 163,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 75,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 25,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 25,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 25,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Number of derivative agreements | 7 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Number of derivative agreements terminated |  |  |  | 1 seb_DerivativeNumberOfInstrumentsTerminated / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Term of derivative contract |  |  |  |  | 10 years |
Payment to terminate derivative agreement |  |  |  | 3,861,000 seb_PaymentsForDerivativeInstrumentOperatingActivities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Eight-year interest rate exchange agreements |  |  |  |  |  |
Derivative commodity instruments |  |  |  |  |  |
Notional amounts | $ 22,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  |  |  |  |
Number of derivative agreements | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  |  |  |  |
Number of derivative agreements terminated | 3 seb_DerivativeNumberOfInstrumentsTerminated / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  |  |  |  |
Number of agreements entered into to replace the terminated agreements | 3 seb_DerivativeNumberOfReplacementAgreements / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  |  |  |  |
Term of derivative contract | 8 years |  |  |  |  |

X
- 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 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional 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 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: 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=35706170&loc=SL5618551-113959 Reference 2: 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=35706170&loc=SL5624171-113959 + Details
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