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Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 13, 2015 | 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
Net premiums earned |  | $ 469,850 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 462,639 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 463,625 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 456,495 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 451,312 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 437,568 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 426,252 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 420,940 us-gaap_PremiumsEarnedNetPropertyAndCasualty |  | $ 1,852,609 us-gaap_PremiumsEarnedNetPropertyAndCasualty | $ 1,736,072 us-gaap_PremiumsEarnedNetPropertyAndCasualty | $ 1,584,119 us-gaap_PremiumsEarnedNetPropertyAndCasualty
Net Investment Income |  | 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
Net realized gains (losses) |  | (389)us-gaap_GainLossOnSaleOfSecuritiesNet |  | 15,231 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 4,539 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 7,218 us-gaap_GainLossOnSaleOfSecuritiesNet |  | (1,208)us-gaap_GainLossOnSaleOfSecuritiesNet |  | 13,431 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 5,154 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 3,355 us-gaap_GainLossOnSaleOfSecuritiesNet |  | 37,703 us-gaap_GainLossOnSaleOfSecuritiesNet | 26,375 us-gaap_GainLossOnSaleOfSecuritiesNet | 13,252 us-gaap_GainLossOnSaleOfSecuritiesNet
Underwriting gain (loss), before federal income tax |  | 38,637 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 34,437 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 10,084 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | (5,015)sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 11,971 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 10,151 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 4,483 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  | 12,161 sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes |  |  |  |
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, net of tax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (997)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
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
Other comprehensive income (loss) |  | (29,337)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | (18,887)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 26,483 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 16,678 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 7,768 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | (2,195)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | (62,643)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 27,881 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | (5,063)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (29,189)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 11,746 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income |  | 12,013 us-gaap_ComprehensiveIncomeNetOfTax |  | 34,275 us-gaap_ComprehensiveIncomeNetOfTax |  | 55,824 us-gaap_ComprehensiveIncomeNetOfTax |  | 34,652 us-gaap_ComprehensiveIncomeNetOfTax |  | 33,103 us-gaap_ComprehensiveIncomeNetOfTax |  | 30,458 us-gaap_ComprehensiveIncomeNetOfTax |  | (35,521)us-gaap_ComprehensiveIncomeNetOfTax |  | 49,189 us-gaap_ComprehensiveIncomeNetOfTax |  | 136,764 us-gaap_ComprehensiveIncomeNetOfTax | 77,229 us-gaap_ComprehensiveIncomeNetOfTax | 49,709 us-gaap_ComprehensiveIncomeNetOfTax
Basic net income per share |  | $ 0.73 us-gaap_EarningsPerShareBasic |  | $ 0.94 us-gaap_EarningsPerShareBasic |  | $ 0.52 us-gaap_EarningsPerShareBasic |  | $ 0.32 us-gaap_EarningsPerShareBasic |  | $ 0.45 us-gaap_EarningsPerShareBasic |  | $ 0.59 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.38 us-gaap_EarningsPerShareBasic |  | $ 2.52 us-gaap_EarningsPerShareBasic | $ 1.91 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic
Diluted net income per share |  | $ 0.72 us-gaap_EarningsPerShareDiluted |  | $ 0.93 us-gaap_EarningsPerShareDiluted |  | $ 0.51 us-gaap_EarningsPerShareDiluted |  | $ 0.31 us-gaap_EarningsPerShareDiluted |  | $ 0.44 us-gaap_EarningsPerShareDiluted |  | $ 0.57 us-gaap_EarningsPerShareDiluted |  | $ 0.48 us-gaap_EarningsPerShareDiluted |  | $ 0.38 us-gaap_EarningsPerShareDiluted |  | $ 2.47 us-gaap_EarningsPerShareDiluted | $ 1.87 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted
Dividends to stockholders |  | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.13 us-gaap_CommonStockDividendsPerShareDeclared | [1] | $ 0.53 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.52 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.52 us-gaap_CommonStockDividendsPerShareDeclared
Price range common stock, high | 28.08 sigi_StockMarketPriceHigh | 27.65 sigi_StockMarketPriceHigh | [2] | 25.46 sigi_StockMarketPriceHigh | [2] | 25.42 sigi_StockMarketPriceHigh | [2] | 26.99 sigi_StockMarketPriceHigh | [2] | 28.31 sigi_StockMarketPriceHigh | [2] | 25.95 sigi_StockMarketPriceHigh | [2] | 24.75 sigi_StockMarketPriceHigh | [2] | 24.13 sigi_StockMarketPriceHigh | [2] |  |  |
Price range of common stock, low | 25.49 sigi_StockMarketPriceLow | 22.01 sigi_StockMarketPriceLow | [2] | 21.97 sigi_StockMarketPriceLow | [2] | 22.14 sigi_StockMarketPriceLow | [2] | 21.38 sigi_StockMarketPriceLow | [2] | 23.55 sigi_StockMarketPriceLow | [2] | 22.61 sigi_StockMarketPriceLow | [2] | 19.58 sigi_StockMarketPriceLow | [2] | 19.53 sigi_StockMarketPriceLow | [2] |  |  |
Accumulated other comprehensive income (loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5,063)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (29,189)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 11,746 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
[1] | 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.
[2] | 2 These ranges of high and low prices of the Parent’s common stock, as reported by the NASDAQ Global Select Market, represent actual transactions. Price quotations do not include retail markups, markdowns, and commissions. The range of high and low prices for common stock for the period beginning January 2, 2015 and ending February 13, 2015 was $25.49 to $28.08.

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of property and casualty premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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