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Note 2 - Discontinued Operations (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 01, 2015
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Net investment income | $ 17,328,000 us-gaap_NetInvestmentIncome |  | $ 15,318,000 us-gaap_NetInvestmentIncome |  |  |
Net gains on investments and other financial instruments | 16,779,000 rdn_NetGainsLossesonInvestmentsandOtherFinancialInstruments |  | 42,968,000 rdn_NetGainsLossesonInvestmentsandOtherFinancialInstruments |  |  |
Revenues | 290,663,000 us-gaap_Revenues |  | 258,174,000 us-gaap_Revenues |  |  |
Policy acquisition costs | 7,750,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |  | 7,017,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |  |  |
Other operating expenses | 54,576,000 us-gaap_OtherCostAndExpenseOperating |  | 54,507,000 us-gaap_OtherCostAndExpenseOperating |  |  |
Costs and Expenses | 153,213,000 us-gaap_CostsAndExpenses |  | 131,077,000 us-gaap_CostsAndExpenses |  |  |
Income from discontinued operations, net of tax | 530,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  | 56,779,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  |  |
Fixed-maturities available for sale—at fair value (amortized cost $677,040 and $528,660) | 695,085,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |  |  | 536,890,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Available-for-sale Securities, Equity Securities | 143,533,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities |  |  |  | 143,368,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities |
Trading securities—at fair value | 1,574,795,000 us-gaap_TradingSecurities |  |  |  | 1,633,584,000 us-gaap_TradingSecurities |
Short-term investments—at fair value | 1,194,280,000 us-gaap_OtherShortTermInvestments |  |  |  | 1,300,872,000 us-gaap_OtherShortTermInvestments |
Other invested assets | 13,953,000 us-gaap_OtherInvestments |  |  |  | 14,585,000 us-gaap_OtherInvestments |
Other assets | 356,713,000 us-gaap_OtherAssets |  |  |  | 375,491,000 us-gaap_OtherAssets |
Total assets held for sale | 1,755,873,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | [1] | 1,795,185,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | [1] | 1,736,444,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |
Unearned premiums | 657,555,000 us-gaap_UnearnedPremiums |  | 580,453,000 us-gaap_UnearnedPremiums |  | 644,504,000 us-gaap_UnearnedPremiums |
Reserve for losses and loss adjustment expense (“LAE”) | 1,384,714,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,893,960,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,560,032,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |
Other liabilities | 310,642,000 us-gaap_OtherLiabilities |  |  |  | 326,743,000 us-gaap_OtherLiabilities |
Total liabilities held for sale | 966,078,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 947,008,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |
Net gains (losses) on other financial instruments | 592,000 rdn_NetGainsLossesOnOtherFinancialInstruments |  | (318,000)rdn_NetGainsLossesOnOtherFinancialInstruments |  |  |
Other income | 1,432,000 us-gaap_OtherIncome |  | 1,126,000 us-gaap_OtherIncome |  |  |
Radian Asset Assurance [Member] |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax | (13,930,000)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 1,007,000 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 6,903,000 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Net investment income | 9,153,000 us-gaap_NetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 8,911,000 us-gaap_NetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Net gains on investments and other financial instruments | 13,668,000 rdn_NetGainsLossesonInvestmentsandOtherFinancialInstruments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 22,182,000 rdn_NetGainsLossesonInvestmentsandOtherFinancialInstruments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Change in fair value of derivative instruments | 2,625,000 us-gaap_DerivativeGainOnDerivative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 50,086,000 us-gaap_DerivativeGainOnDerivative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Revenues | 26,453,000 us-gaap_Revenues / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 88,082,000 us-gaap_Revenues / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Provision for losses | 502,000 us-gaap_IncurredClaimsPropertyCasualtyAndLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 5,649,000 us-gaap_IncurredClaimsPropertyCasualtyAndLiability / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Policy acquisition costs | (191,000)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 1,597,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Other operating expenses | 4,107,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 5,402,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Costs and Expenses | 4,418,000 us-gaap_CostsAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 12,648,000 us-gaap_CostsAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Equity in net (loss) income of affiliates | (13,000)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | (13,000)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Income from operations of businesses held for sale | 22,022,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 75,421,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Income tax provision on classification as held for sale | 7,562,000 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 18,642,000 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Income from discontinued operations, net of tax | 530,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  | 56,779,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |
Fixed-maturities available for sale—at fair value (amortized cost $677,040 and $528,660) | 226,334,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 224,552,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Available-for-sale Securities, Equity Securities | 4,019,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 3,749,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Trading securities—at fair value | 679,972,000 us-gaap_TradingSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 689,887,000 us-gaap_TradingSecurities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Short-term investments—at fair value | 449,391,000 us-gaap_OtherShortTermInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 435,413,000 us-gaap_OtherShortTermInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Other invested assets | 108,080,000 us-gaap_OtherInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 108,206,000 us-gaap_OtherInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Other assets | 288,077,000 us-gaap_OtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 274,637,000 us-gaap_OtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Total assets held for sale | 1,755,873,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 1,736,444,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Unearned premiums | 152,445,000 us-gaap_UnearnedPremiums / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 158,921,000 us-gaap_UnearnedPremiums / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Reserve for losses and loss adjustment expense (“LAE”) | 32,420,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 31,558,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
VIE debt | 82,238,000 rdn_VariableInterestEntityDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 85,016,000 rdn_VariableInterestEntityDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Derivative liabilities | 187,462,000 us-gaap_DerivativeLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 183,370,000 us-gaap_DerivativeLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Other liabilities | 511,513,000 us-gaap_OtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 488,143,000 us-gaap_OtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Total liabilities held for sale | 966,078,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |  |  |  | 947,008,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_RadianAssetAssuranceMember |
Sale of Radian Asset Assurance [Member] | Parent Company |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax | 13,900,000 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  | 468,000,000 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income from discontinued operations, net of tax | 500,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |
Subsequent Event [Member] | Sale of Radian Asset Assurance [Member] | Parent Company |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction |  |  |  |  |  | 100.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  | 810,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  |  |  |  |  | $ 789,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rdn_SaleofRadianAssetAssuranceMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
[1] | Assets held for sale are not part of the Mortgage Insurance or Services segments.

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