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Commitments and Contingencies (Details 2) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 28, 2012 | Jun. 30, 2012 item
Commitments |  |  |  |  |
2015 | $ 881,042,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary |  |  |  |
2016 | 190,460,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary |  |  |  |
2017 | 128,909,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary |  |  |  |
2018 | 105,403,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary |  |  |  |
2019 | 44,293,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary |  |  |  |
Thereafter | 253,917,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears |  |  |  |
Operating Leases |  |  |  |  |
2015 | 25,407,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |  |
2016 | 23,342,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |  |
2017 | 24,137,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |  |
2018 | 23,711,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |  |
2019 | 23,640,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |  |
Thereafter | 212,389,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |  |  |
Rental expense for operating leases | 35,252,000 us-gaap_OperatingLeasesRentExpenseNet | 33,995,000 us-gaap_OperatingLeasesRentExpenseNet | 29,224,000 us-gaap_OperatingLeasesRentExpenseNet |  |
Commodity Trading and Milling |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Number of dry bulk vessels to be built |  |  |  |  | 4 seb_NumberOfDryBulkVesselsToBeBuilt / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember
Cost of dry bulk vessels to be built |  |  |  |  | 90,000,000 seb_LongTermCommitmentAmount / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember
Amount paid under the agreement |  |  |  | 8,300,000 seb_PaymentsUnderContractualObligations / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |
Additional payments over the course of the agreement | 19,153,000 seb_AdditionalTerminalAgreementPayment / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |
Hog procurement contracts |  |  |  |  |
Commitments |  |  |  |  |
2015 | 188,281,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember |  |  |  |
2016 | 134,284,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember |  |  |  |
2017 | 76,084,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember |  |  |  |
2018 | 56,090,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember |  |  |  |
Hog procurement contracts | Pork segment |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Amount paid under the contract | 226,925,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember | 190,519,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember | 190,471,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_HogProcurementContractsMember |  |
Grain and feed ingredients |  |  |  |  |
Commitments |  |  |  |  |
2015 | 80,989,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_GrainAndFeedIngredientsMember |  |  |  |
2016 | 1,535,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_GrainAndFeedIngredientsMember |  |  |  |
2017 | 220,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_GrainAndFeedIngredientsMember |  |  |  |
Grain purchase contracts for resale |  |  |  |  |
Commitments |  |  |  |  |
2015 | 370,540,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_GrainPurchaseContractsForResaleMember |  |  |  |
Fuel supply contract |  |  |  |  |
Commitments |  |  |  |  |
2015 | 43,251,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_FuelSupplyContractMember |  |  |  |
Equipment purchases and facility improvements |  |  |  |  |
Commitments |  |  |  |  |
2015 | 34,385,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_EquipmentPurchasesAndFacilityImprovementsMember |  |  |  |
Construction of new dry bulk vessels |  |  |  |  |
Commitments |  |  |  |  |
2015 | 58,842,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ConstructionOfNewDryBulkVesselsMember |  |  |  |
Other purchase commitments |  |  |  |  |
Commitments |  |  |  |  |
2015 | 10,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
2016 | 745,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
2017 | 34,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
2018 | 34,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
2019 | 34,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
Thereafter | 66,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_OtherPurchaseCommitmentsMember |  |  |  |
Total firm purchase commitments |  |  |  |  |
Commitments |  |  |  |  |
2015 | 786,288,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
2016 | 136,564,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
2017 | 76,338,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
2018 | 56,124,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
2019 | 34,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
Thereafter | 66,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_PurchaseCommitmentIncludingLongTermCommitmentMember |  |  |  |
Vessel, time and voyage-charters |  |  |  |  |
Commitments |  |  |  |  |
2015 | 58,223,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
2016 | 20,116,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
2017 | 18,250,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
2018 | 18,250,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
2019 | 18,250,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
Thereafter | 41,440,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |  |  |
Vessel, time and voyage-charters | Marine |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Amount paid under the contract | 86,816,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember | 90,784,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember | 88,110,000 us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_VesselTimeAndVoyageCharterArrangementsMember |  |
Vessel, time and voyage-charters | Marine | Minimum |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Contract period | 1 year |  |  |  |
Vessel, time and voyage-charters | Marine | Maximum |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Contract period | 10 years |  |  |  |
Contract grower finishing agreements |  |  |  |  |
Commitments |  |  |  |  |
2015 | 11,124,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
2016 | 10,438,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
2017 | 10,184,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
2018 | 7,318,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
2019 | 2,369,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
Thereafter | 22,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |
Contract grower finishing agreements | Pork segment |  |  |  |  |
Conditional and Unconditional Commitments |  |  |  |  |
Amount paid under the agreement | 12,922,000 seb_PaymentsUnderContractualObligations / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember | 13,194,000 seb_PaymentsUnderContractualObligations / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember | 13,641,000 seb_PaymentsUnderContractualObligations / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |
Incentive payments for achieving certain performance standards | $ 1,300,000 seb_PerformanceIncentivePaymentsUnderContractualObligations / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = seb_ContractGrowerFinishingAgreementsMember |  |  |  |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Definition The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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