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Consolidated Statements of Cash Flow (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities    
Net income $ 39,708us-gaap_NetIncomeLoss $ 17,974us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 14,041us-gaap_DepreciationAmortizationAndAccretionNet 10,578us-gaap_DepreciationAmortizationAndAccretionNet
Sale of renewal rights 0us-gaap_GainLossOnSaleOfBusiness (8,000)us-gaap_GainLossOnSaleOfBusiness
Stock-based compensation expense 3,681us-gaap_ShareBasedCompensation 4,176us-gaap_ShareBasedCompensation
Undistributed losses (gains) of equity method investments 3,541us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions (33)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Net realized gains (18,883)us-gaap_RealizedInvestmentGainsLosses (7,218)us-gaap_RealizedInvestmentGainsLosses
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 44,964sigi_IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables 58,938sigi_IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables
Increase in unearned premiums, net of prepaid reinsurance 41,966sigi_IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance 20,254sigi_IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance
Decrease in net federal income taxes 11,034us-gaap_IncreaseDecreaseInIncomeTaxes 4,332us-gaap_IncreaseDecreaseInIncomeTaxes
Increase in premiums receivable (38,110)us-gaap_IncreaseDecreaseInPremiumsReceivable (29,042)us-gaap_IncreaseDecreaseInPremiumsReceivable
Increase in deferred policy acquisition costs (6,348)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease (4,697)us-gaap_DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease
Decrease in interest and dividends due or accrued 510us-gaap_IncreaseDecreaseInInterestAndDividendsReceivable 414us-gaap_IncreaseDecreaseInInterestAndDividendsReceivable
Decrease in accrued salaries and benefits (16,290)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (21,869)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Decrease in accrued insurance expenses (24,255)us-gaap_IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities (26,957)us-gaap_IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities
Increase in other assets and other liabilities 5,015us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 16,914us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net adjustments 20,866us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 17,790us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities 60,574us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 35,764us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities    
Purchase of fixed income securities, available-for-sale (238,000)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt (182,809)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Purchase of equity securities, available-for-sale (150,500)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity (61,360)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity
Purchase of other investments (1,724)us-gaap_PaymentsToAcquireOtherInvestments (4,615)us-gaap_PaymentsToAcquireOtherInvestments
Purchase of short-term investments (333,550)us-gaap_PaymentsToAcquireShortTermInvestments (398,348)us-gaap_PaymentsToAcquireShortTermInvestments
Sale of fixed income securities, available-for-sale 9,305us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt 1,302us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Sale of short-term investments 341,146us-gaap_ProceedsFromSaleOfShortTermInvestments 434,865us-gaap_ProceedsFromSaleOfShortTermInvestments
Redemption and maturities of fixed income securities, held-to-maturity 20,720us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities 9,396us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities
Redemption and maturities of fixed income securities, available-for-sale 145,661us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities 104,358us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Sale of equity securities, available-for-sale 129,052us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 61,523us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Distributions from other investments 5,845us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 5,704us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Purchase of property and equipment (4,064)us-gaap_PaymentsForProceedsFromProductiveAssets (5,699)us-gaap_PaymentsForProceedsFromProductiveAssets
Sale of renewal rights 0us-gaap_ProceedsFromDivestitureOfBusinesses 8,000us-gaap_ProceedsFromDivestitureOfBusinesses
Net cash used in investing activities (76,109)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (27,683)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities    
Dividends to stockholders (7,591)us-gaap_PaymentsOfDividendsCommonStock (6,948)us-gaap_PaymentsOfDividendsCommonStock
Acquisition of treasury stock (3,580)us-gaap_PaymentsForRepurchaseOfCommonStock (2,653)us-gaap_PaymentsForRepurchaseOfCommonStock
Net proceeds from stock purchase and compensation plans 2,271us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,261us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Proceeds from borrowings 15,000us-gaap_ProceedsFromFederalHomeLoanBankBorrowings 0us-gaap_ProceedsFromFederalHomeLoanBankBorrowings
Excess tax benefits from share-based payment arrangements 1,398us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 770us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Repayments of capital lease obligations (1,118)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (459)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Net cash provided by (used in) financing activities 6,380us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (8,029)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) increase in cash (9,155)us-gaap_CashPeriodIncreaseDecrease 52us-gaap_CashPeriodIncreaseDecrease
Cash, beginning of year 23,959us-gaap_Cash 193us-gaap_Cash
Cash, end of period $ 14,804us-gaap_Cash $ 245us-gaap_Cash