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v2.4.1.9

Notes Payable and Long-Term Debt (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014
Notes Payable and Long-Term Debt |
Adjusted leverage ratio, maximum | 3.5 seb_DebtInstrumentCovenantAdjustedLeverageRatioMaximum
Minimum net worth base requirement | $ 1,870,445,000 seb_DebtInstrumentCovenantMinimumNetWorthRequirementBaseAmount
Percentage of consolidated net income added to net worth base amount | 25.00%seb_DebtInstrumentCovenantPercentageOfConsolidatedNetIncomeAddedToMinimumNetWorthRequirement
Maximum dividends per year | $ 25,000,000 seb_DebtInstrumentCovenantDividendRestrictionMaximumAmount
Sum of subsidiary indebtedness and priority indebtedness as a percentage of consolidated tangible net worth, maximum | 20.00%seb_DebtInstrumentCovenantSumOfSubsidiaryIndebtednessAndPriorityIndebtednessAsPercentageOfNetWorthMaximum

X
- Definition Represents the maximum adjusted leverage ratio per the terms of the debt covenants. + References No definition available. + Details
Name: | seb_DebtInstrumentCovenantAdjustedLeverageRatioMaximum
Namespace Prefix: | seb_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum amount of dividends that may be paid per year per the terms of the debt covenants. + References No definition available. + Details
Name: | seb_DebtInstrumentCovenantDividendRestrictionMaximumAmount
Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the base amount that is used in the calculation of minimum tangible net worth requirement per the terms of the debt covenants. + References No definition available. + Details
Name: | seb_DebtInstrumentCovenantMinimumNetWorthRequirementBaseAmount
Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of the consolidated net income that is used in the calculation of the minimum net worth requirement per the terms of the debt covenants. + References No definition available. + Details
Name: | seb_DebtInstrumentCovenantPercentageOfConsolidatedNetIncomeAddedToMinimumNetWorthRequirement
Namespace Prefix: | seb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum percentage of the sum of subsidiary indebtedness and priority indebtedness as a percentage of net worth allowed per the terms of the debt covenants. + References No definition available. + Details
Name: | seb_DebtInstrumentCovenantSumOfSubsidiaryIndebtednessAndPriorityIndebtednessAsPercentageOfNetWorthMaximum
Namespace Prefix: | seb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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