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Derivatives and Fair Value of Financial Instruments (Details 4) (USD $)
Apr. 04, 2015
Dec. 31, 2014
Commodities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Margin account $ 21,752,000us-gaap_MarginDepositAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 $ 4,314,000us-gaap_MarginDepositAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodities | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 4,147,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 6,136,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Derivative assets and liabilities, net basis 16,612,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 9,267,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodities | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives 9,722,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 1,779,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Derivative assets and liabilities, net basis 435,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 596,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Foreign currencies | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 1,039,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 1,675,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Foreign currencies | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives 424,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 407,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Interest rate swaps | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 9,256,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 7,715,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember