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Employee Benefits (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Deferred compensation plan |  |  |
Number of investments, which are taken as reference to measure the interest that may be acquired | 3 seb_DeferredCompensationArrangementInvestmentOptionPlanNumberOfInvestmentsReferredToMeasureInterest |  |
Employer contribution as percentage of the employees' reduced compensation | 3.00%seb_DeferredCompensationArrangementEmployerContributionAsPercentageOfEmployeesReducedCompensation |  |
Number of deferred compensation plans | 2 seb_NumberOfDeferredCompensationPlans |  |
Deferred compensation plan expense | $ 3,142,000 seb_DeferredCompensationArrangementCompensationExpense | $ 5,942,000 seb_DeferredCompensationArrangementCompensationExpense | $ 4,148,000 seb_DeferredCompensationArrangementCompensationExpense
Deferred compensation plan liability included in other liabilities | 42,759,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent | 41,144,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent |
Deferred compensation plan assets included in other current assets | 47,635,000 us-gaap_DeferredCompensationPlanAssets | 45,350,000 us-gaap_DeferredCompensationPlanAssets |
Investment income related to the mark-to-market of investments treated as trading securities | 3,086,000 seb_DeferredCompensationPlanInvestmentIncomeLossRelatedToTradingSecurities | 5,863,000 seb_DeferredCompensationPlanInvestmentIncomeLossRelatedToTradingSecurities | 4,076,000 seb_DeferredCompensationPlanInvestmentIncomeLossRelatedToTradingSecurities
Defined contribution plan covering domestic, salaried and clerical employees |  |  |
Defined contribution plans |  |  |
Employer contribution (as a percent of employee contributions) | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember
Employer contribution limit per calendar year (as a percent of compensation) | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember
Vesting percentage after one year of service | 20.00%seb_DefinedContributionPlanVestingPercentageAfterOneYearOfService / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember |  |
Additional vesting percentage with each additional complete year of service | 20.00%seb_DefinedContributionPlanVestingPercentageWithEachAdditionalCompletedYearOfServiceAfterOneYear / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember |  |
Contribution expense | $ 2,245,000 us-gaap_DefinedContributionPlanCostRecognized / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | $ 2,142,000 us-gaap_DefinedContributionPlanCostRecognized / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember | $ 2,063,000 us-gaap_DefinedContributionPlanCostRecognized / seb_DefinedContributionPlanAxis = seb_DefinedContributionPlanCoveringDomesticSalariedAndClericalEmployeesMember

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- Definition The compensation expense recognized during the period relating to the deferred compensation arrangement. + References No definition available. + Details
Name: | seb_DeferredCompensationArrangementCompensationExpense
Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the employer's contribution as a percentage of employees' reduced compensation under the deferred compensation plan which allows certain employees to reduce their compensation in exchange for values in investments. + References No definition available. + Details
Name: | seb_DeferredCompensationArrangementEmployerContributionAsPercentageOfEmployeesReducedCompensation
Namespace Prefix: | seb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of investments, which are taken as reference to measure the interest that may be acquired by employees in exchange for reduction in their compensation. + References No definition available. + Details
Name: | seb_DeferredCompensationArrangementInvestmentOptionPlanNumberOfInvestmentsReferredToMeasureInterest
Namespace Prefix: | seb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the deferred compensation plan investment income (loss) related to the mark-to-market of the investments treated as trading securities. + References No definition available. + Details
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Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the percentage of vesting after first year of service. + References No definition available. + Details
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Namespace Prefix: | seb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the additional vesting percentage with each additional completed year of service, after the first year of service. + References No definition available. + Details
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Namespace Prefix: | seb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of deferred compensation plans. + References No definition available. + Details
Name: | seb_NumberOfDeferredCompensationPlans
Namespace Prefix: | seb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
Name: | us-gaap_DeferredCompensationPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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