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v2.4.1.9

Parent Corporation Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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ASSETS |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $49,890 - 2014; $455,447 – 2013) | $ 4,066,122 us-gaap_AvailableForSaleSecuritiesDebtSecurities | $ 3,715,536 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |
Short-term investments | 131,972 us-gaap_OtherShortTermInvestments | 174,251 us-gaap_OtherShortTermInvestments |  |
Cash | 23,959 us-gaap_Cash | 193 us-gaap_Cash | 210 us-gaap_Cash | 762 us-gaap_Cash
Current federal income tax | 0 us-gaap_IncomeTaxReceivable | 512 us-gaap_IncomeTaxReceivable |  |
Deferred federal income tax | 98,449 us-gaap_DeferredTaxAssetsNet | 122,613 us-gaap_DeferredTaxAssetsNet |  |
Other assets | 73,215 us-gaap_OtherAssets | 75,727 us-gaap_OtherAssets |  |
Total assets | 6,581,550 us-gaap_Assets | 6,270,170 us-gaap_Assets |  |
Liabilities: |  |  |  |
Notes payable | 379,297 us-gaap_LongTermDebt | 392,414 us-gaap_LongTermDebt |  |
Other liabilities | 190,675 us-gaap_OtherLiabilities | 203,476 us-gaap_OtherLiabilities |  |
Total liabilities | 5,305,964 us-gaap_Liabilities | 5,116,242 us-gaap_Liabilities |  |
Stockholders’ Equity: |  |  |  |
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding | 0 us-gaap_PreferredStockValue | 0 us-gaap_PreferredStockValue |  |
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 99,947,933 - 2014; 99,120,235 - 2013 | 199,896 us-gaap_CommonStockValue | 198,240 us-gaap_CommonStockValue |  |
Additional paid-in capital | 305,385 us-gaap_AdditionalPaidInCapitalCommonStock | 288,182 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained earnings | 1,313,440 us-gaap_RetainedEarningsAccumulatedDeficit | 1,202,015 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated other comprehensive income | 19,788 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 24,851 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Treasury stock - at cost (shares: 43,353,181 - 2014; 43,198,622 - 2013) | (562,923)us-gaap_TreasuryStockValue | (559,360)us-gaap_TreasuryStockValue |  |
Total stockholders’ equity | 1,275,586 us-gaap_StockholdersEquity | 1,153,928 us-gaap_StockholdersEquity | 1,090,592 us-gaap_StockholdersEquity |
Total liabilities and stockholders’ equity | 6,581,550 us-gaap_LiabilitiesAndStockholdersEquity | 6,270,170 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $49,890 - 2014; $455,447 – 2013) | 50,028 us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 55,623 us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Short-term investments | 16,605 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,399 us-gaap_OtherShortTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cash | 16,367 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 193 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 210 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 722 us-gaap_Cash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in subsidiaries | 1,604,162 sigi_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,493,996 sigi_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current federal income tax | 16,848 us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 28,471 us-gaap_IncomeTaxReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred federal income tax | 15,781 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 15,122 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 7,268 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,410 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 1,727,059 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,618,214 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liabilities: |  |  |  |
Notes payable | 334,297 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 334,414 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany notes payable | 88,961 sigi_IntercompanyNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 102,721 sigi_IntercompanyNotesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued Long Term Stock Compensation | 21,890 sigi_AccruedLongTermStockCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,828 sigi_AccruedLongTermStockCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 6,325 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,323 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 451,473 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 464,286 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders’ Equity: |  |  |  |
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding | 0 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 99,947,933 - 2014; 99,120,235 - 2013 | 199,896 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 198,240 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in capital | 305,385 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 288,182 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 1,313,440 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,202,015 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive income | 19,788 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 24,851 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock - at cost (shares: 43,353,181 - 2014; 43,198,622 - 2013) | (562,923)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (559,360)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total stockholders’ equity | 1,275,586 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,153,928 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders’ equity | $ 1,727,059 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 1,618,214 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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