$SIGI
Selective Insurance Group Inc Stock $sigi

$sigi Overview Financials Valuation SEC Filings Company Website

2013 Q1 Form 10-Q Financial Statement

#000023055713000008 Filed on April 25, 2013

Income Statement

Concept	2013 Q1	2012 Q1
Revenue	$459.9M	$419.3M
YoY Change	9.68%	3.77%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$13.10M	$1.100M
YoY Change	1090.91%	-87.78%
% of Gross Profit
Operating Expenses	$425.3M	$391.5M
YoY Change	8.63%	5.02%
Operating Profit
YoY Change
Interest Expense	-$5.800M	-$4.700M
YoY Change	23.4%	2.17%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$28.87M	$23.19M
YoY Change	24.48%	-11.48%
Income Tax	$6.563M	$5.098M
% Of Pretax Income	22.73%	21.98%
Net Earnings	$21.31M	$18.09M
YoY Change	17.77%	-11.74%
Net Earnings / Revenue	4.63%	4.31%
Basic Earnings Per Share	$0.38	$0.33
Diluted Earnings Per Share	$0.38	$0.33
COMMON SHARES
Basic Shares Outstanding	55.53M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2013 Q1	2012 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents
Short-Term Investments
Other Short-Term Assets	$134.2M	$137.3M
YoY Change	-2.26%	24.7%
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$169.5M	$172.7M
YoY Change	-1.85%	17.64%
LONG-TERM ASSETS
Property, Plant & Equipment	$48.33M	$43.90M
YoY Change	10.08%	7.6%
Goodwill	$7.849M
YoY Change
Intangibles
YoY Change
Long-Term Investments	$4.422B	$4.154B
YoY Change	6.44%	4.9%
Other Assets	$105.0M	$116.4M
YoY Change	-9.79%	24.36%
Total Long-Term Assets	$6.175B	$5.457B
YoY Change	13.15%	6.41%
TOTAL ASSETS
Total Short-Term Assets	$169.5M	$172.7M
Total Long-Term Assets	$6.175B	$5.457B
Total Assets	$6.344B	$5.630B
YoY Change	12.69%	6.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$103.9M	$113.9M
YoY Change	-8.78%	18.65%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$107.0M	$119.5M
YoY Change	-10.46%	24.48%
LONG-TERM LIABILITIES
Long-Term Debt	$392.4M	$307.4M
YoY Change	27.65%	17.19%
Other Long-Term Liabilities	$228.5M	$146.1M
YoY Change	56.4%	8.54%
Total Long-Term Liabilities	$620.9M	$453.5M
YoY Change	36.91%	14.26%
TOTAL LIABILITIES
Total Short-Term Liabilities	$107.0M	$119.5M
Total Long-Term Liabilities	$620.9M	$453.5M
Total Liabilities	$5.208B	$4.547B
YoY Change	14.54%	8.47%
SHAREHOLDERS EQUITY
Retained Earnings	$1.139B
YoY Change
Common Stock	$474.1M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$558.8M
YoY Change
Treasury Stock Shares	43.18M shares
Shareholders Equity	$1.136B	$1.083B
YoY Change
Total Liabilities & Shareholders Equity	$6.344B	$5.630B
YoY Change	12.69%	6.72%

Cashflow Statement

Concept	2013 Q1	2012 Q1
OPERATING ACTIVITIES
Net Income	$21.31M	$18.09M
YoY Change	17.77%	-11.74%
Depreciation, Depletion And Amortization	$13.10M	$1.100M
YoY Change	1090.91%	-87.78%
Cash From Operating Activities	$28.14M	$35.86M
YoY Change	-21.52%	28.05%
INVESTING ACTIVITIES
Capital Expenditures	-$3.700M	-$2.300M
YoY Change	60.87%	64.29%
Acquisitions	$0.00	-$255.0K
YoY Change	-100.0%
Other Investing Activities	-$95.40M	-$26.00M
YoY Change	266.92%	40.54%
Cash From Investing Activities	-$99.11M	-$28.27M
YoY Change	250.63%	42.05%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$3.176M	$3.015M
YoY Change	5.34%
Debt Paid & Issued, Net	$100.0M	$0.00
YoY Change
Cash From Financing Activities	$71.06M	-$8.089M
YoY Change	-978.45%	-2.54%
NET CHANGE
Cash From Operating Activities	$28.14M	$35.86M
Cash From Investing Activities	-$99.11M	-$28.27M
Cash From Financing Activities	$71.06M	-$8.089M
Net Change In Cash	$86.00K	-$501.0K
YoY Change	-117.17%	150.5%
FREE CASH FLOW
Cash From Operating Activities	$28.14M	$35.86M
Capital Expenditures	-$3.700M	-$2.300M
Free Cash Flow	$31.84M	$38.16M
YoY Change	-16.55%	29.78%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2013Q1	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	3075000	USD
CY2012Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	0	USD
CY2012Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	35984000	USD
CY2013Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	35254000	USD
CY2012Q4	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	152396000	USD
CY2013Q1	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	103868000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	169428000	USD
CY2013Q1	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	171715000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	121391000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	120007000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	38474000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	68287000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	81921000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	54040000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities	1658000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities	1634000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	270654000	USD
CY2013Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	276717000	USD
CY2013Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	6832000	USD
CY2012Q1	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	17762000	USD
CY2012Q4	us-gaap	Assets Assets	6794216000	USD
CY2013Q1	us-gaap	Assets Assets	6344027000	USD
CY2012Q1	us-gaap	Assumed Premiums Earned Property And Casualty AssumedPremiumsEarnedPropertyAndCasualty	15049000	USD
CY2013Q1	us-gaap	Assumed Premiums Earned Property And Casualty AssumedPremiumsEarnedPropertyAndCasualty	12463000	USD
CY2013Q1	us-gaap	Assumed Premiums Written Property And Casualty AssumedPremiumsWrittenPropertyAndCasualty	8482000	USD
CY2012Q1	us-gaap	Assumed Premiums Written Property And Casualty AssumedPremiumsWrittenPropertyAndCasualty	21989000	USD
CY2013Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3314989000	USD
CY2012Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3130683000	USD
CY2012Q4	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	132441000	USD
CY2013Q1	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	143564000	USD
CY2013Q1	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3640726000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3447395000	USD
CY2013Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3458553000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3263124000	USD
CY2013Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	376874000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	125166000	USD
CY2013Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	20190000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	19736000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1046526000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2041329000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	29950000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	348176000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3296013000	USD
CY2013Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3465981000	USD
CY2013Q1	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	174745000	USD
CY2012Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	151382000	USD
CY2013Q1	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-4093000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	-2834000	USD
CY2013Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	-1060000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	-1558000	USD
CY2013Q1	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	-3033000	USD
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	-1276000	USD
CY2013Q1	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	-186266000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	-187105000	USD
CY2012Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	396157000	USD
CY2013Q1	us-gaap	Basis Of Accounting BasisOfAccounting	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Basis of Presentation</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">These interim unaudited consolidated financial statements (“Financial Statements”) include the accounts of the Parent and its subsidiaries, and have been prepared in conformity with: (i) U.S. generally accepted accounting principles (“GAAP”); and (ii) the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The preparation of the Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported financial statement balances, as well as the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. All significant intercompany accounts and transactions between the Parent and its subsidiaries are eliminated in consolidation.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain amounts in our prior years' Financial Statements and related notes have been reclassified to conform to the 2013 presentation. Such reclassifications had no effect on our net income, stockholders' equity, or cash flows.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">These Financial Statements reflect all adjustments that, in our opinion, are normal, recurring, and necessary for a fair presentation of our results of operations and financial condition. The Financial Statements cover the </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">first</font><font style="font-family:inherit;font-size:10pt;"> quarters ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">March 31, 2013</font><font style="font-family:inherit;font-size:10pt;"> (“</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">First Quarter 2013</font><font style="font-family:inherit;font-size:10pt;">”) and </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">March 31, 2012</font><font style="font-family:inherit;font-size:10pt;"> (“</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">First Quarter 2012</font><font style="font-family:inherit;font-size:10pt;">”). The Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited financial statements. Results of operations for any interim period are not necessarily indicative of results for a full year. Consequently, the Financial Statements should be read in conjunction with the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2012</font><font style="font-family:inherit;font-size:10pt;"> (“</font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2012 Annual Report</font><font style="font-family:inherit;font-size:10pt;">”).</font></div></div>
CY2013Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	431081000	USD
CY2013Q1	us-gaap	Cash Cash	296000	USD
CY2012Q4	us-gaap	Cash Cash	210000	USD
CY2012Q1	us-gaap	Cash Cash	261000	USD
CY2011Q4	us-gaap	Cash Cash	762000	USD
CY2013Q1	us-gaap	Cash Period Increase Decrease CashPeriodIncreaseDecrease	86000	USD
CY2012Q1	us-gaap	Cash Period Increase Decrease CashPeriodIncreaseDecrease	-501000	USD
CY2013Q1	us-gaap	Ceded Premiums Earned Property And Casualty CededPremiumsEarnedPropertyAndCasualty	85589000	USD
CY2012Q1	us-gaap	Ceded Premiums Earned Property And Casualty CededPremiumsEarnedPropertyAndCasualty	88208000	USD
CY2013Q1	us-gaap	Ceded Premiums Written Property And Casualty CededPremiumsWrittenPropertyAndCasualty	87174000	USD
CY2012Q1	us-gaap	Ceded Premiums Written Property And Casualty CededPremiumsWrittenPropertyAndCasualty	77783000	USD
CY2013Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2013Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	2
CY2013Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	2
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	360000000	shares
CY2013Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	360000000	shares
CY2013Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	98708185	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	98194224	shares
CY2013Q1	us-gaap	Common Stock Value CommonStockValue	197416000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	196388000	USD
CY2013Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	49189000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	28783000	USD
CY2013Q1	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7453000	USD
CY2012Q1	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7178000	USD
CY2012Q1	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2080000	USD
CY2013Q1	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-890000	USD
CY2013Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	158486000	USD
CY2012Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	155523000	USD
CY2012Q1	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	-8570000	USD
CY2013Q1	us-gaap	Deferred Policy Acquisition Costs Period Increase Decrease DeferredPolicyAcquisitionCostsPeriodIncreaseDecrease	-2963000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	119136000	USD
CY2013Q1	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	105014000	USD
CY2012Q1	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	0	USD
CY2013Q1	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments	-16000	USD
CY2012Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9748000	USD
CY2013Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	13148000	USD
CY2013Q1	us-gaap	Direct Premiums Earned Property And Casualty DirectPremiumsEarnedPropertyAndCasualty	494066000	USD
CY2012Q1	us-gaap	Direct Premiums Earned Property And Casualty DirectPremiumsEarnedPropertyAndCasualty	451988000	USD
CY2013Q1	us-gaap	Direct Premiums Written Property And Casualty DirectPremiumsWrittenPropertyAndCasualty	528816000	USD
CY2012Q1	us-gaap	Direct Premiums Written Property And Casualty DirectPremiumsWrittenPropertyAndCasualty	475966000	USD
CY2013Q1	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	1500000	USD
CY2012Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	-997000	USD
CY2013Q1	us-gaap	Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation	538000	USD
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2012Q1	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	870000	USD
CY2013Q1	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	1271000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	1389000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-1089000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-4034000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	12911000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	3742000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	2089000	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	12642000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3	0	USD
CY2012	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	8533000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3	5642000	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	27910000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	42277000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	37191000	USD
CY2013Q1	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	62100000	USD
CY2013Q1	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	58000000	USD
CY2013Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	5304000	USD
CY2012Q1	us-gaap	Gain Loss On Sale Of Securities Net GainLossOnSaleOfSecuritiesNet	4779000	USD
CY2013Q1	us-gaap	Goodwill Goodwill	7849000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	7849000	USD
CY2012Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	554069000	USD
CY2013Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	507771000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1218000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	358000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3968000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	3751000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	46831000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	41427000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	389774000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	363382000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	3687000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	2880000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities Fair Value HeldToMaturitySecuritiesDebtMaturitiesFairValue	543553000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	103261000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	100082000	USD
CY2012Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	594661000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	543553000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Transferred Security At Carrying Value HeldToMaturitySecuritiesTransferredSecurityAtCarryingValue	15800000	USD
CY2013Q1	us-gaap	Held To Maturity Securities Transferred To Available For Sale Securities Unrealized Gain Loss HeldToMaturitySecuritiesTransferredToAvailableForSaleSecuritiesUnrealizedGainLoss	900000	USD
CY2012Q1	us-gaap	Impairment Of Investments ImpairmentOfInvestments	257000	USD
CY2013Q1	us-gaap	Impairment Of Investments ImpairmentOfInvestments	1919000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	18093000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	22305000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	23191000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	28868000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.40
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.33
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.33
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.40
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.02
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.02
CY2012Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-764000	USD
CY2013Q1	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-426000	USD
CY2013Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6563000	USD
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5098000	USD
CY2013Q1	us-gaap	Income Tax Receivable IncomeTaxReceivable	0	USD
CY2012Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	2569000	USD
CY2012Q1	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-5356000	USD
CY2013Q1	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-4528000	USD
CY2012Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	4227000	USD
CY2013Q1	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	5290000	USD
CY2013Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-384000	USD
CY2012Q1	us-gaap	Increase Decrease In Interest And Dividends Receivable IncreaseDecreaseInInterestAndDividendsReceivable	-1108000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-7373000	USD
CY2013Q1	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	26357000	USD
CY2012Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	25107000	USD
CY2013Q1	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	36202000	USD
CY2013Q1	us-gaap	Increase Decrease In Property And Casualty Insurance Liabilities IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities	-12378000	USD
CY2012Q1	us-gaap	Increase Decrease In Property And Casualty Insurance Liabilities IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities	-13476000	USD
CY2012Q1	us-gaap	Incurred Claims Property Casualty And Liability IncurredClaimsPropertyCasualtyAndLiability	252906000	USD
CY2013Q1	us-gaap	Incurred Claims Property Casualty And Liability IncurredClaimsPropertyCasualtyAndLiability	269849000	USD
CY2013Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	5831000	USD
CY2012Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	4700000	USD
CY2012Q1	us-gaap	Interest Paid InterestPaid	2111000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	-38000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicBenefitCostBeforeTax	-10000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-6000	USD
CY2013Q1	us-gaap	Interest Paid InterestPaid	1964000	USD
CY2012Q4	us-gaap	Investments Investments	4330019000	USD
CY2013Q1	us-gaap	Investments Investments	4421792000	USD
CY2013Q1	us-gaap	Liabilities Liabilities	5207682000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	5703624000	USD
CY2013Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6344027000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6794216000	USD
CY2013Q1	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	3474392000	USD
CY2012Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	4068941000	USD
CY2013Q1	us-gaap	Long Term Debt LongTermDebt	392393000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	307387000	USD
CY2013Q1	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"> Organization</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Selective Insurance Group, Inc., through its subsidiaries, (collectively referred to as “we,” “us,” or “our”) offers standard and excess and surplus lines (“E&S”) property and casualty insurance products. Selective Insurance Group, Inc. (referred to as the “Parent”) was incorporated in New Jersey in 1977 and its main offices are located in Branchville, New Jersey. The Parent’s common stock is publicly traded on the NASDAQ Global Select Market under the symbol “SIGI.” </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We classify our business into </font><font style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">three</font><font style="font-family:inherit;font-size:10pt;"> operating segments: </font></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our Standard Insurance Operations segment, which is comprised of both commercial lines ("Commercial Lines") and personal lines ("Personal Lines") business, sells property and casualty insurance products and services in the standard market, including flood insurance through the National Flood Insurance Program's ("NFIP") write-your-own ("WYO") program;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our E&S Insurance Operations segment, which is comprised of Commercial Lines property and casualty insurance products and services that are unavailable in the standard market due to market conditions or characteristics of the insured that are caused by the insured's claim history or the characteristics of their business; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our Investments segment - invests the premiums collected by our Standard and E&S Insurance Operations, as well as amounts generated through our capital management strategies, which may include the issuance of debt and equity securities.</font></div></td></tr></table></div>
CY2012Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-8089000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	71058000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-28267000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-99112000	USD
CY2013Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	28140000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	35855000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	18093000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	21308000	USD
CY2013Q1	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3
CY2013Q1	us-gaap	Other Assets OtherAssets	124197000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	57661000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax	-13000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Tax OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax	-4000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	28600000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	0	USD
CY2013Q1	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	15400000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-25000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1384000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10690000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	27881000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-28600000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-1428000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-45866000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-928000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-29813000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	44000000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-500000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-16053000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-3884000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Reclassification Pension And Other Postretirement Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationPensionAndOtherPostretirementBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostTax	487000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Loss Reclassification Pension And Other Postretirement Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeLossReclassificationPensionAndOtherPostretirementBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostTax	644000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	1390000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostBeforeTax	1840000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	1196000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Of Defined Benefit Plans Net Gain Loss Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	903000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	19804000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3684000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	12873000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2394000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6931000	USD
CY2013Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1290000	USD
CY2012Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	10593000	USD
CY2013Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	15873000	USD
CY2012Q1	us-gaap	Other General Expense OtherGeneralExpense	7732000	USD
CY2013Q1	us-gaap	Other General Expense OtherGeneralExpense	13687000	USD
CY2013Q1	us-gaap	Other Income OtherIncome	2784000	USD
CY2012Q1	us-gaap	Other Income OtherIncome	3533000	USD
CY2012Q4	us-gaap	Other Investments OtherInvestments	114076000	USD
CY2013Q1	us-gaap	Other Investments OtherInvestments	109855000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	200194000	USD
CY2013Q1	us-gaap	Other Liabilities OtherLiabilities	228479000	USD
CY2012Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	214479000	USD
CY2013Q1	us-gaap	Other Short Term Investments OtherShortTermInvestments	163440000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	109000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	9000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	7486000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	6711000	USD
CY2011Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	6602000	USD
CY2012Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	7477000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	0	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	0	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	164000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest	30000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-24000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterest	-129000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterest	-13000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	421000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	1949000	USD
CY2012Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	2263000	USD
CY2013Q1	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	3673000	USD
CY2013Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3176000	USD
CY2012Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3015000	USD
CY2012Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6713000	USD
CY2013Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6824000	USD
CY2012Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	226525000	USD
CY2013Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	308289000	USD
CY2012Q1	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	39724000	USD
CY2013Q1	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	2000	USD
CY2012Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-255000	USD
CY2013Q1	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2012Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	2990000	USD
CY2013Q1	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	2329000	USD
CY2012Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	368210000	USD
CY2013Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	644274000	USD
CY2013Q1	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	365646000	USD
CY2012Q1	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	252203000	USD
CY2013Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0
CY2012Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2013Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2012Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2013Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2013Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2013Q1	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2012Q1	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	378829000	USD
CY2013Q1	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	420940000	USD
CY2013Q1	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	4152000	USD
CY2012Q4	us-gaap	Premiums Receivable Allowance For Doubtful Accounts PremiumsReceivableAllowanceForDoubtfulAccounts	3906000	USD
CY2013Q1	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	520590000	USD
CY2012Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	484388000	USD
CY2012Q1	us-gaap	Premiums Written Net Property And Casualty PremiumsWrittenNetPropertyAndCasualty	420172000	USD
CY2013Q1	us-gaap	Premiums Written Net Property And Casualty PremiumsWrittenNetPropertyAndCasualty	450124000	USD
CY2012Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	132637000	USD
CY2013Q1	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	134222000	USD
CY2012Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	287000	USD
CY2013Q1	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	225000	USD
CY2013Q1	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	3447000	USD
CY2012Q1	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	5299000	USD
CY2013Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	178623000	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	769000	USD
CY2013Q1	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1164000	USD
CY2013Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	124975000	USD
CY2012Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	84124000	USD
CY2013Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	28644000	USD
CY2012Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	38879000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	6900000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	71800000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	6851000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	14308000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	0	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	57513000	USD
CY2013Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	695313000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	410780000	USD
CY2013Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	48327000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	47131000	USD
CY2012Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	10599000	USD
CY2013Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	9074000	USD
CY2012Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	9896000	USD
CY2013Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	104871000	USD
CY2012Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	1421109000	USD
CY2013Q1	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	788000000	USD
CY2012Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	4358000	USD
CY2013Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	100000000	USD
CY2012Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1125154000	USD
CY2013Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1139111000	USD
CY2013Q1	us-gaap	Revenues Revenues	459949000	USD
CY2012Q1	us-gaap	Revenues Revenues	419348000	USD
CY2013Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	3355000	USD
CY2013Q1	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	459885000	USD
CY2012Q1	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	419272000	USD
CY2013Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3692000	USD
CY2012Q1	us-gaap	Share Based Compensation ShareBasedCompensation	3329000	USD
CY2013Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	17314	shares
CY2012Q1	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	22916	shares
CY2012Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	540322	shares
CY2013Q1	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	496647	shares
CY2013Q1	us-gaap	Stockholders Equity StockholdersEquity	1136345000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1090592000	USD
CY2012Q1	us-gaap	Stockholders Equity StockholdersEquity	1082918000	USD
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	43030776	shares
CY2013Q1	us-gaap	Treasury Stock Shares TreasuryStockShares	43177212	shares
CY2013Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	146436	shares
CY2012Q1	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	168614	shares
CY2013Q1	us-gaap	Treasury Stock Value TreasuryStockValue	558820000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	555644000	USD
CY2012Q4	us-gaap	Unearned Premiums UnearnedPremiums	974706000	USD
CY2013Q1	us-gaap	Unearned Premiums UnearnedPremiums	1005475000	USD
CY2012Q1	sigi	Accretion Of Credit Loss Impairments Previously Recognized Due To Increase In Cash Flows Expected To Be Collected AccretionOfCreditLossImpairmentsPreviouslyRecognizedDueToIncreaseInCashFlowsExpectedToBeCollected	0	USD
CY2013Q1	sigi	Accretion Of Credit Loss Impairments Previously Recognized Due To Increase In Cash Flows Expected To Be Collected AccretionOfCreditLossImpairmentsPreviouslyRecognizedDueToIncreaseInCashFlowsExpectedToBeCollected	0	USD
CY2012Q4	sigi	Accumulated Other Comprehensive Income Loss Held To Maturity Related Net Unrealized Gain Loss AccumulatedOtherComprehensiveIncomeLossHeldToMaturityRelatedNetUnrealizedGainLoss	2594000	USD
CY2013Q1	sigi	Accumulated Other Comprehensive Income Loss Held To Maturity Related Net Unrealized Gain Loss AccumulatedOtherComprehensiveIncomeLossHeldToMaturityRelatedNetUnrealizedGainLoss	2022000	USD
CY2012Q4	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	2445000	USD
CY2012Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Before Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleBeforeTax	794000	USD
CY2013Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Before Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleBeforeTax	636000	USD
CY2013Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Net Of Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetOfTax	413000	USD
CY2012Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Net Of Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleNetOfTax	516000	USD
CY2012Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleTax	278000	USD
CY2013Q1	sigi	Amortization Of Net Unrealized Gains Losses On Held To Maturity Transferred From Available For Sale Tax AmortizationOfNetUnrealizedGainsLossesOnHeldToMaturityTransferredFromAvailableForSaleTax	223000	USD
CY2013Q1	sigi	Amortization Of Non Credit Other Than Temporary Impairment Losses On Held To Maturity Securities Net Of Tax AmortizationOfNonCreditOtherThanTemporaryImpairmentLossesOnHeldToMaturitySecuritiesNetOfTax	5000	USD
CY2012Q4	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	1309000	USD
CY2013Q1	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	3065000	USD
CY2012Q4	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	126384000	USD
CY2013Q1	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	377232000	USD
CY2013Q1	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	1893000	USD
CY2012Q4	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	23704000	USD
CY2013Q1	sigi	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	23941000	USD
CY2013Q1	sigi	Carrying Value Bonds On Deposit With Various State And Regulatory Agencies CarryingValueBondsOnDepositWithVariousStateAndRegulatoryAgencies	27200000	USD
CY2013Q1	sigi	Changes In Net Unrealized Gain Loss Related To Held To Maturity Securities ChangesInNetUnrealizedGainLossRelatedToHeldToMaturitySecurities	-572000	USD
CY2012Q1	sigi	Comprehensive Income Loss Before Tax ComprehensiveIncomeLossBeforeTax	39637000	USD
CY2013Q1	sigi	Comprehensive Income Loss Before Tax ComprehensiveIncomeLossBeforeTax	70227000	USD
CY2012Q1	sigi	Comprehensive Income Loss Tax ComprehensiveIncomeLossTax	10854000	USD
CY2013Q1	sigi	Comprehensive Income Loss Tax ComprehensiveIncomeLossTax	21038000	USD
CY2013Q1	sigi	Estimated Receivable Related To Sale Of Subsidiary EstimatedReceivableRelatedToSaleOfSubsidiary	1000000	USD
CY2013Q1	sigi	Federal Income Taxes Paid Net FederalIncomeTaxesPaidNet	0	USD
CY2012Q1	sigi	Federal Income Taxes Paid Net FederalIncomeTaxesPaidNet	0	USD
CY2013Q1	sigi	Held To Maturity Securities Amortized Cost HeldToMaturitySecuritiesAmortizedCost	504719000	USD
CY2012Q4	sigi	Held To Maturity Securities Amortized Cost HeldToMaturitySecuritiesAmortizedCost	550143000	USD
CY2013Q1	sigi	Held To Maturity Securities Average Duration HeldToMaturitySecuritiesAverageDuration	P2Y4M24D
CY2012Q4	sigi	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	33000	USD
CY2013Q1	sigi	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	32000	USD
CY2012Q4	sigi	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	887000	USD
CY2013Q1	sigi	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	833000	USD
CY2013Q1	sigi	Held To Maturity Securities Gross Unrecognized Holding Gains HeldToMaturitySecuritiesGrossUnrecognizedHoldingGains	35809000	USD
CY2012Q4	sigi	Held To Maturity Securities Gross Unrecognized Holding Gains HeldToMaturitySecuritiesGrossUnrecognizedHoldingGains	40615000	USD
CY2013Q1	sigi	Held To Maturity Securities Gross Unrecognized Holding Losses HeldToMaturitySecuritiesGrossUnrecognizedHoldingLosses	-27000	USD
CY2012Q4	sigi	Held To Maturity Securities Gross Unrecognized Holding Losses HeldToMaturitySecuritiesGrossUnrecognizedHoldingLosses	-23000	USD
CY2013Q1	sigi	Held To Maturity Securities Net Unrealized Gains Losses HeldToMaturitySecuritiesNetUnrealizedGainsLosses	-3052000	USD
CY2012Q4	sigi	Held To Maturity Securities Net Unrealized Gains Losses HeldToMaturitySecuritiesNetUnrealizedGainsLosses	-3926000	USD
CY2012Q1	sigi	Held To Maturity Securities Realized Gain HeldToMaturitySecuritiesRealizedGain	153000	USD
CY2013Q1	sigi	Held To Maturity Securities Realized Gain HeldToMaturitySecuritiesRealizedGain	0	USD
CY2012Q1	sigi	Held To Maturity Securities Sold Security Realized Loss HeldToMaturitySecuritiesSoldSecurityRealizedLoss	81000	USD
CY2013Q1	sigi	Held To Maturity Securities Sold Security Realized Loss HeldToMaturitySecuritiesSoldSecurityRealizedLoss	37000	USD
CY2012Q4	sigi	Held To Maturity Securities Unrecognized Gains Losses Aggregate Continuous Unrealized Loss Position Less Than Twelve Months HeldToMaturitySecuritiesUnrecognizedGainsLossesAggregateContinuousUnrealizedLossPositionLessThanTwelveMonths	-29000	USD
CY2013Q1	sigi	Held To Maturity Securities Unrecognized Gains Losses Aggregate Continuous Unrealized Loss Position Less Than Twelve Months HeldToMaturitySecuritiesUnrecognizedGainsLossesAggregateContinuousUnrealizedLossPositionLessThanTwelveMonths	-30000	USD
CY2012Q4	sigi	Held To Maturity Securities Unrecognized Gains Losses Aggregate Continuous Unrealized Loss Position Twelve Months Or Longer HeldToMaturitySecuritiesUnrecognizedGainsLossesAggregateContinuousUnrealizedLossPositionTwelveMonthsOrLonger	-791000	USD
CY2013Q1	sigi	Held To Maturity Securities Unrecognized Gains Losses Aggregate Continuous Unrealized Loss Position Twelve Months Or Longer HeldToMaturitySecuritiesUnrecognizedGainsLossesAggregateContinuousUnrealizedLossPositionTwelveMonthsOrLonger	-766000	USD
CY2012Q1	sigi	Income From Continuing Operations And Discontinued Operations Tax IncomeFromContinuingOperationsAndDiscontinuedOperationsTax	5098000	USD
CY2013Q1	sigi	Income From Continuing Operations And Discontinued Operations Tax IncomeFromContinuingOperationsAndDiscontinuedOperationsTax	6025000	USD
CY2012Q1	sigi	Income Loss From Continuing Operations And Discontinued Operations Before Federal Income Tax IncomeLossFromContinuingOperationsAndDiscontinuedOperationsBeforeFederalIncomeTax	23191000	USD
CY2013Q1	sigi	Income Loss From Continuing Operations And Discontinued Operations Before Federal Income Tax IncomeLossFromContinuingOperationsAndDiscontinuedOperationsBeforeFederalIncomeTax	27333000	USD
CY2012Q1	sigi	Increase Decrease In Reserves For Losses And Loss Expenses Net Of Reinsurance Recoverables IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables	6311000	USD
CY2013Q1	sigi	Increase Decrease In Reserves For Losses And Loss Expenses Net Of Reinsurance Recoverables IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables	38556000	USD
CY2012Q1	sigi	Increase Decrease In Unearned Premiums Net Of Prepaid Reinsurance And Advance Premiums IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsuranceAndAdvancePremiums	41769000	USD
CY2013Q1	sigi	Increase Decrease In Unearned Premiums Net Of Prepaid Reinsurance And Advance Premiums IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsuranceAndAdvancePremiums	30106000	USD
CY2012	sigi	Increase Decrease Of Receivable Related To Sale Of Subsidiary If Retention Assumption Were To Change IncreaseDecreaseOfReceivableRelatedToSaleOfSubsidiaryIfRetentionAssumptionWereToChange	100000	USD
CY2013Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Net Of Tax NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeNetOfTax	24000	USD
CY2013Q2	sigi	Maximum Employer Match Of Employee Contribution Of Defined Compensation To Retirement Savings Plan Percentage MaximumEmployerMatchOfEmployeeContributionOfDefinedCompensationToRetirementSavingsPlanPercentage	0.04
CY2013Q1	sigi	Net Investment Income Earned NetInvestmentIncomeEarned	32870000	USD
CY2012Q1	sigi	Net Investment Income Earned NetInvestmentIncomeEarned	32628000	USD
CY2013Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Before Reclassifications NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeBeforeReclassifications	19000	USD
CY2012Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeGross	-367000	USD
CY2013Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeGross	-37000	USD
CY2012Q4	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Loss Position More Than Twelve Months NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeLossPositionMoreThanTwelveMonths	900000	USD
CY2013Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Loss Position More Than Twelve Months NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeLossPositionMoreThanTwelveMonths	600000	USD
CY2012Q1	sigi	Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Net Of Tax NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeNetOfTax	238000	USD
CY2013Q1	sigi	Number Of Fixed Maturity Securities Pledged As Collateral For Borrowings With Federal Home Loan Bank Of Indianapolis NumberOfFixedMaturitySecuritiesPledgedAsCollateralForBorrowingsWithFederalHomeLoanBankOfIndianapolis	31	Securities
CY2013Q1	sigi	Number Of Held To Maturity Securities Transferred Security At Carrying Value NumberOfHeldToMaturitySecuritiesTransferredSecurityAtCarryingValue	7	Securities
CY2013Q1	sigi	Number Of Insurance Subsidiaries NumberOfInsuranceSubsidiaries	10	USD
CY2013Q1	sigi	Number Of Securities In Unrealized Unrecognized Loss Position NumberOfSecuritiesInUnrealizedUnrecognizedLossPosition	175	Securities
CY2012Q4	sigi	Number Of Securities In Unrealized Unrecognized Loss Position NumberOfSecuritiesInUnrealizedUnrecognizedLossPosition	101	Securities
CY2012Q1	sigi	Other Comprehensive Income Loss Amortization Pension And Other Post Retirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostRetirementBenefitPlansCurtailmentExpenseRecognizedInNetPeriodicBenefitCostNetOfTax	0	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Amortization Pension And Other Post Retirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostRetirementBenefitPlansCurtailmentExpenseRecognizedInNetPeriodicBenefitCostNetOfTax	-11000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansCurtailmentExpenseRecognizedInNetPeriodicBenefitCostBeforeTax	-16000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansCurtailmentExpenseRecognizedInNetPeriodicBenefitCostTax	-5000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	31013000	USD
CY2012Q1	sigi	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plan Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlanAdjustmentNetOfTax	-928000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plan Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlanAdjustmentNetOfTax	-29813000	USD
CY2012Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeBeforeTax	-4359000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeBeforeTax	-6057000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeNetOfTax	-3937000	USD
CY2012Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeNetOfTax	-2833000	USD
CY2012Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeTax	1526000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Gains Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForGainsIncludedInNetIncomeTax	2120000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment For Held To Maturity Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForHeldToMaturitySecuritiesNetOfTax	-466000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociNetOfTax	-3132000	USD
CY2013Q1	sigi	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansNetOfTax	1213000	USD
CY2013Q1	sigi	Other Investments Realized Losses OtherInvestmentsRealizedLosses	-860000	USD
CY2012Q1	sigi	Other Investments Realized Losses OtherInvestmentsRealizedLosses	0	USD
CY2012Q4	sigi	Percentage Decline In Fair Value Percentage PercentageDeclineInFairValuePercentage	0.05
CY2013Q1	sigi	Percentage Decline In Fair Value Percentage PercentageDeclineInFairValuePercentage	0.03
CY2009Q4	sigi	Percentage Of Interest Sold In Subsidiary PercentageOfInterestSoldInSubsidiary	1.00
CY2013Q1	sigi	Percentage Of Unpaid Nfip Claims Ceded By Federal Government PercentageOfUnpaidNfipClaimsCededByFederalGovernment	1.00
CY2012Q1	sigi	Policy Acquisition Costs PolicyAcquisitionCosts	127958000	USD
CY2013Q1	sigi	Policy Acquisition Costs PolicyAcquisitionCosts	139528000	USD
CY2013Q1	sigi	Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss SecuritiesInUnrealizedUnrecognizedLossPositionForMoreThanTwelveMonthsUnrealizedUnrecognizedLoss	1100000	USD
CY2012Q4	sigi	Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss SecuritiesInUnrealizedUnrecognizedLossPositionForMoreThanTwelveMonthsUnrealizedUnrecognizedLoss	1700000	USD
CY2012Q1	sigi	Short Term Investments Realized Losses ShortTermInvestmentsRealizedLosses	2000	USD
CY2013Q1	sigi	Short Term Investments Realized Losses ShortTermInvestmentsRealizedLosses	0	USD
CY2012Q1	sigi	Total Investment Revenues TotalInvestmentRevenues	36986000	USD
CY2013Q1	sigi	Total Investment Revenues TotalInvestmentRevenues	36225000	USD
CY2013Q1	sigi	Total Segment Income Loss From Continuing Operations Before Federal Income Tax TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax	48386000	USD
CY2012Q1	sigi	Total Segment Income Loss From Continuing Operations Before Federal Income Tax TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax	35623000	USD
CY2013Q1	sigi	Total Unrealized Gains Losses On Investment Securities TotalUnrealizedGainsLossesOnInvestmentSecurities	-1932000	USD
CY2012Q1	sigi	Total Unrealized Gains Losses On Investment Securities TotalUnrealizedGainsLossesOnInvestmentSecurities	9762000	USD
CY2012Q1	sigi	Total Unrealized Gains Losses On Investment Securities Gross TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross	15018000	USD
CY2013Q1	sigi	Total Unrealized Gains Losses On Investment Securities Gross TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross	-2972000	USD
CY2012Q1	sigi	Total Unrealized Gains Losses On Investment Securities Tax TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax	5256000	USD
CY2013Q1	sigi	Total Unrealized Gains Losses On Investment Securities Tax TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax	-1040000	USD
CY2013Q1	sigi	Unrealized Unrecognized Loss UnrealizedUnrecognizedLoss	4162000	USD
CY2012Q4	sigi	Unrealized Unrecognized Loss UnrealizedUnrecognizedLoss	2934000	USD
CY2013Q1	sigi	Unrealized Unrecognized Losses Period Increase Decrease UnrealizedUnrecognizedLossesPeriodIncreaseDecrease	1200000	USD
CY2013Q1	sigi	Unsettled Proceeds From Sale Of Securities UnsettledProceedsFromSaleOfSecurities	35600000	USD
CY2013Q1	dei	Amendment Flag AmendmentFlag	false
CY2013Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2013Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013Q1	dei	Document Period End Date DocumentPeriodEndDate	2013-03-31
CY2013Q1	dei	Document Type DocumentType	10-Q
CY2013Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000230557
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	55530973	shares
CY2013Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q1	dei	Entity Registrant Name EntityRegistrantName	SELECTIVE INSURANCE GROUP INC

Files In Submission

Name	View Source	Status
0000230557-13-000008-index-headers.html	Edgar Link	pending
0000230557-13-000008-index.html	Edgar Link	pending
0000230557-13-000008.txt	Edgar Link	pending
0000230557-13-000008-xbrl.zip	Edgar Link	pending
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sigi-20130331.xml	Edgar Link	completed
sigi-20130331.xsd	Edgar Link	pending
sigi-20130331_cal.xml	Edgar Link	unprocessable
sigi-20130331_def.xml	Edgar Link	unprocessable
sigi-20130331_lab.xml	Edgar Link	unprocessable
sigi-20130331_pre.xml	Edgar Link	unprocessable
sigi-3312013x10q.htm	Edgar Link	pending
sigi-ex11_3312013xq1.htm	Edgar Link	pending
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sigi-ex321_3312013xq1.htm	Edgar Link	pending
sigi-ex322_3312013xq1.htm	Edgar Link	pending

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$SIGI
Selective Insurance Group Inc Stock $sigi

2013 Q1 Form 10-Q Financial Statement

#000023055713000008 Filed on April 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SIGI Selective Insurance Group Inc Stock $sigi

2013 Q1 Form 10-Q Financial Statement

#000023055713000008 Filed on April 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SIGI
Selective Insurance Group Inc Stock $sigi