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v2.4.1.9

Parent Corporation Statements of Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues: |  |  |  |  |  |  |  |  |  |  |
Dividends Paid to Parent Company |  |  |  |  |  |  |  |  | $ (57,500)us-gaap_CashDividendsPaidToParentCompany |  |
Net investment income earned | 32,108 us-gaap_NetInvestmentIncome | 34,292 us-gaap_NetInvestmentIncome | 36,774 us-gaap_NetInvestmentIncome | 35,534 us-gaap_NetInvestmentIncome | 35,313 us-gaap_NetInvestmentIncome | 32,457 us-gaap_NetInvestmentIncome | 34,003 us-gaap_NetInvestmentIncome | 32,870 us-gaap_NetInvestmentIncome | 138,708 us-gaap_NetInvestmentIncome | 134,643 us-gaap_NetInvestmentIncome | 131,877 us-gaap_NetInvestmentIncome
Other income |  |  |  |  |  |  |  |  | 16,945 us-gaap_OtherIncome | 12,294 us-gaap_OtherIncome | 9,118 us-gaap_OtherIncome
Total revenues |  |  |  |  |  |  |  |  | 2,034,861 us-gaap_Revenues | 1,903,741 us-gaap_Revenues | 1,734,102 us-gaap_Revenues
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 22,086 us-gaap_InterestExpenseDebt | 22,538 us-gaap_InterestExpenseDebt | 18,872 us-gaap_InterestExpenseDebt
Other expenses |  |  |  |  |  |  |  |  | 33,673 us-gaap_OtherCostAndExpenseOperating | 35,686 us-gaap_OtherCostAndExpenseOperating | 30,462 us-gaap_OtherCostAndExpenseOperating
Total expenses |  |  |  |  |  |  |  |  | 1,837,730 us-gaap_BenefitsLossesAndExpenses | 1,759,939 us-gaap_BenefitsLossesAndExpenses | 1,696,467 us-gaap_BenefitsLossesAndExpenses
Federal income tax benefit: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | 28,415 us-gaap_CurrentFederalTaxExpenseBenefit | 24,147 us-gaap_CurrentFederalTaxExpenseBenefit | 5,647 us-gaap_CurrentFederalTaxExpenseBenefit
Deferred |  |  |  |  |  |  |  |  | 26,889 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 12,240 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (5,975)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total federal income tax benefit |  |  |  |  |  |  |  |  | 55,304 us-gaap_IncomeTaxExpenseBenefit | 36,387 us-gaap_IncomeTaxExpenseBenefit | (328)us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations | 41,350 us-gaap_IncomeLossFromContinuingOperations | 53,162 us-gaap_IncomeLossFromContinuingOperations | 29,341 us-gaap_IncomeLossFromContinuingOperations | 17,974 us-gaap_IncomeLossFromContinuingOperations | 25,335 us-gaap_IncomeLossFromContinuingOperations | 32,653 us-gaap_IncomeLossFromContinuingOperations | 27,122 us-gaap_IncomeLossFromContinuingOperations | 22,305 us-gaap_IncomeLossFromContinuingOperations | 141,827 us-gaap_IncomeLossFromContinuingOperations | 107,415 us-gaap_IncomeLossFromContinuingOperations | 37,963 us-gaap_IncomeLossFromContinuingOperations
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (997)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income | 41,350 us-gaap_NetIncomeLoss | 53,162 us-gaap_NetIncomeLoss | 29,341 us-gaap_NetIncomeLoss | 17,974 us-gaap_NetIncomeLoss | 25,335 us-gaap_NetIncomeLoss | 32,653 us-gaap_NetIncomeLoss | 27,122 us-gaap_NetIncomeLoss | 21,308 us-gaap_NetIncomeLoss | 141,827 us-gaap_NetIncomeLoss | 106,418 us-gaap_NetIncomeLoss | 37,963 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Dividends Paid to Parent Company |  |  |  |  |  |  |  |  | 57,511 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32,129 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 196,091 us-gaap_CashDividendsPaidToParentCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net investment income earned |  |  |  |  |  |  |  |  | 620 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 585 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 495 us-gaap_NetInvestmentIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income |  |  |  |  |  |  |  |  | 342 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 55 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 464 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total revenues |  |  |  |  |  |  |  |  | 58,473 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 32,769 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 197,050 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses: |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 23,840 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24,309 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,711 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses |  |  |  |  |  |  |  |  | 24,575 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27,888 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,632 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total expenses |  |  |  |  |  |  |  |  | 48,415 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52,197 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,343 us-gaap_BenefitsLossesAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) from continuing operations before federal income tax |  |  |  |  |  |  |  |  | 10,058 sigi_IncomeLossFromContinuingOperationsBeforeFederalIncomeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (19,428)sigi_IncomeLossFromContinuingOperationsBeforeFederalIncomeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 155,707 sigi_IncomeLossFromContinuingOperationsBeforeFederalIncomeTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Federal income tax benefit: |  |  |  |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |  | (15,920)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (22,779)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4,602)us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred |  |  |  |  |  |  |  |  | (646)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,835 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9,347)us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total federal income tax benefit |  |  |  |  |  |  |  |  | (16,566)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17,944)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (13,949)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) from continuing operations before equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 26,624 sigi_NetIncomeLossFromContinuingOperationsBeforeEquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,484)sigi_NetIncomeLossFromContinuingOperationsBeforeEquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 169,656 sigi_NetIncomeLossFromContinuingOperationsBeforeEquityInUndistributedIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity In Undistributed Income Of Continuing Subsidiaries Net Of Tax |  |  |  |  |  |  |  |  | (115,203)sigi_EquityInUndistributedIncomeOfContinuingSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (108,899)sigi_EquityInUndistributedIncomeOfContinuingSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 sigi_EquityInUndistributedIncomeOfContinuingSubsidiariesNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends in excess of continuing subsidiaries' current year earnings |  |  |  |  |  |  |  |  | 0 sigi_DividendsInExcessOfContinuingSubsidiariesCurrentYearEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 sigi_DividendsInExcessOfContinuingSubsidiariesCurrentYearEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (131,693)sigi_DividendsInExcessOfContinuingSubsidiariesCurrentYearEarnings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income from continuing operations |  |  |  |  |  |  |  |  | 141,827 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 107,415 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 37,963 us-gaap_IncomeLossFromContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (997)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 141,827 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 106,418 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 37,963 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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