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Derivatives and Fair Value of Financial Instruments (Details 5) (USD $)
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Commodities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Margin account $ 4,314,000us-gaap_MarginDepositAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
$ 29,822,000us-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 6,136,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
2,331,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Derivative assets and liabilities, net basis 9,267,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
16,731,000seb_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 1,779,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
16,014,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Derivative assets and liabilities, net basis 596,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
592,000seb_NetFairValueOfDerivativeAssetsNetOfDerivativeLiabilitiesAndNetOfMarginDeposit
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Foreign currencies    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Loss due to credit risk associated with derivative contracts 1,675,000us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Number of counterparties 6seb_DerivativeCreditRiskNumberOfCounterparties
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Foreign currencies | Other current assets    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Asset Derivatives 1,675,000us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
2,763,000us-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 407,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
101,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Interest rate swaps    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Loss due to credit risk associated with derivative contracts 0us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Interest rate swaps | Other current liabilities    
Fair value of each type of derivative and its location in the Consolidated Balance Sheets    
Liability Derivatives $ 7,715,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 4,103,000us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember