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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Net premiums earned $ 1,852,609us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 1,736,072us-gaap_PremiumsEarnedNetPropertyAndCasualty $ 1,584,119us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net Investment Income 138,708us-gaap_NetInvestmentIncome 134,643us-gaap_NetInvestmentIncome 131,877us-gaap_NetInvestmentIncome
Net realized gains:      
Net realized investment gains 37,703us-gaap_GainLossOnSaleOfSecuritiesNet 26,375us-gaap_GainLossOnSaleOfSecuritiesNet 13,252us-gaap_GainLossOnSaleOfSecuritiesNet
Other-than-temporary impairments (11,104)us-gaap_ImpairmentOfInvestments (5,566)us-gaap_ImpairmentOfInvestments (1,711)us-gaap_ImpairmentOfInvestments
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (77)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (2,553)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Total net realized gains 26,599us-gaap_RealizedInvestmentGainsLosses 20,732us-gaap_RealizedInvestmentGainsLosses 8,988us-gaap_RealizedInvestmentGainsLosses
Other income 16,945us-gaap_OtherIncome 12,294us-gaap_OtherIncome 9,118us-gaap_OtherIncome
Total revenues 2,034,861us-gaap_Revenues 1,903,741us-gaap_Revenues 1,734,102us-gaap_Revenues
Expenses:      
Losses and loss expenses incurred 1,157,501us-gaap_IncurredClaimsPropertyCasualtyAndLiability 1,121,738us-gaap_IncurredClaimsPropertyCasualtyAndLiability 1,120,990us-gaap_IncurredClaimsPropertyCasualtyAndLiability
Policy acquisition costs 624,470sigi_PolicyAcquisitionCosts 579,977sigi_PolicyAcquisitionCosts 526,143sigi_PolicyAcquisitionCosts
Interest expense 22,086us-gaap_InterestExpenseDebt 22,538us-gaap_InterestExpenseDebt 18,872us-gaap_InterestExpenseDebt
Other expenses 33,673us-gaap_OtherCostAndExpenseOperating 35,686us-gaap_OtherCostAndExpenseOperating 30,462us-gaap_OtherCostAndExpenseOperating
Total expenses 1,837,730us-gaap_BenefitsLossesAndExpenses 1,759,939us-gaap_BenefitsLossesAndExpenses 1,696,467us-gaap_BenefitsLossesAndExpenses
Income from continuing operations, before federal income tax 197,131us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 143,802us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 37,635us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Federal income tax expense (benefit):      
Current 28,415us-gaap_CurrentFederalTaxExpenseBenefit 24,147us-gaap_CurrentFederalTaxExpenseBenefit 5,647us-gaap_CurrentFederalTaxExpenseBenefit
Deferred 26,889us-gaap_DeferredFederalIncomeTaxExpenseBenefit 12,240us-gaap_DeferredFederalIncomeTaxExpenseBenefit (5,975)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total federal income tax expense (benefit) 55,304us-gaap_IncomeTaxExpenseBenefit 36,387us-gaap_IncomeTaxExpenseBenefit (328)us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations 141,827us-gaap_IncomeLossFromContinuingOperations 107,415us-gaap_IncomeLossFromContinuingOperations 37,963us-gaap_IncomeLossFromContinuingOperations
Loss on disposal of discontinued operations, net of tax of $(538) – 2013 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax (997)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income $ 141,827us-gaap_NetIncomeLoss $ 106,418us-gaap_NetIncomeLoss $ 37,963us-gaap_NetIncomeLoss
Earnings per share:      
Basic net income from continuing operations $ 2.52us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.93us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.69us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic net loss from discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic net income $ 2.52us-gaap_EarningsPerShareBasic $ 1.91us-gaap_EarningsPerShareBasic $ 0.69us-gaap_EarningsPerShareBasic
Diluted net income from continuing operations $ 2.47us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.89us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.68us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted net loss from discontinued operations $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted net income $ 2.47us-gaap_EarningsPerShareDiluted $ 1.87us-gaap_EarningsPerShareDiluted $ 0.68us-gaap_EarningsPerShareDiluted
Dividends to stockholders $ 0.53us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared