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Note 3 - Segment Reporting Schedule of Segment Reporting Information by Segment (Details) (USD $) | 3 Months Ended |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Operating Segments | 2 us-gaap_NumberOfOperatingSegments |  |  |  |  |
Net premiums earned-insurance | $ 224,595,000 us-gaap_PremiumsEarnedNet |  | $ 198,762,000 us-gaap_PremiumsEarnedNet |  |  |
Services revenue | 30,529,000 us-gaap_SalesRevenueServicesNet |  | 0 us-gaap_SalesRevenueServicesNet |  |  |
Net investment income | 17,328,000 us-gaap_NetInvestmentIncome |  | 15,318,000 us-gaap_NetInvestmentIncome |  |  |
Other income | 1,432,000 us-gaap_OtherIncome |  | 1,126,000 us-gaap_OtherIncome |  |  |
Provision for losses | 45,028,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency |  | 49,626,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency |  |  |
Policy acquisition costs | 7,750,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |  | 7,017,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense |  |  |
Direct cost of services | 18,451,000 us-gaap_CostOfServices |  | 0 us-gaap_CostOfServices |  |  |
Other operating expenses before corporate allocations (3) | 54,576,000 us-gaap_OtherCostAndExpenseOperating |  | 54,507,000 us-gaap_OtherCostAndExpenseOperating |  |  |
Cash and investments | 3,678,850,000 us-gaap_InvestmentsAndCash |  | 3,302,787,000 us-gaap_InvestmentsAndCash |  |  |
Restricted cash | 14,220,000 us-gaap_RestrictedCashAndCashEquivalents |  | 22,366,000 us-gaap_RestrictedCashAndCashEquivalents |  | 14,031,000 us-gaap_RestrictedCashAndCashEquivalents |
Goodwill | 194,246,000 us-gaap_Goodwill |  | 2,095,000 us-gaap_Goodwill |  |  |
Other intangible assets, net | 99,552,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 188,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |
Assets held for sale (5) | 1,755,873,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | [1] | 1,795,185,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | [1] | 1,736,444,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |
Total assets (5) | 6,813,855,000 us-gaap_Assets | [1] | 5,528,985,000 us-gaap_Assets | [1] | 6,859,963,000 us-gaap_Assets |
Unearned premiums | 657,555,000 us-gaap_UnearnedPremiums |  | 580,453,000 us-gaap_UnearnedPremiums |  | 644,504,000 us-gaap_UnearnedPremiums |
Reserve for losses and LAE | 1,384,714,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,893,960,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 1,560,032,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |
Net Gains/Losses on All Financial Instruments | 16,779,000 rdn_NetGainsLossesonAllFinancialInstruments |  | 43,107,000 rdn_NetGainsLossesonAllFinancialInstruments | [2] |  |
Business Combination, Acquisition Related Costs | (207,000)us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  |
Mortgage Insurance Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net premiums written—insurance | 241,908,000 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 212,953,000 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Increase in unearned premiums | (17,313,000)us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | (14,191,000)us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Net premiums earned-insurance | 224,595,000 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 198,762,000 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Services revenue | 0 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Net investment income | 17,328,000 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] | 15,318,000 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [4] |  |
Other income | 1,331,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] | 996,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [4] |  |
Revenue Non GAAP Basis | 243,254,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [5] | 215,076,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [6] |  |
Provision for losses | 45,851,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 49,626,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Change In Present Value of Estimated Credit Loss Payments |  |  | (139,000)rdn_ChangeInPresentValueofEstimatedCreditLossPayments / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Policy acquisition costs | 7,750,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 7,017,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Direct cost of services | 0 us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Other operating expenses before corporate allocations (3) | 34,050,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [7] | 37,764,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Total Expenses Non-GAAP | 87,651,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [8] | 94,546,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Adjusted pretax operating income before corporate allocations | 155,603,000 rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 120,530,000 rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Allocation of corporate operating expenses (1) | 9,758,000 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] | 15,884,000 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [4] |  |
Allocation of interest expense (1) | 19,953,000 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [3] | 19,927,000 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [4] |  |
Adjusted pretax operating income (loss) | 125,892,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [10],[9] | 84,719,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [10],[9] |  |
Cash and investments | 3,669,413,000 us-gaap_InvestmentsAndCash / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 3,302,763,000 us-gaap_InvestmentsAndCash / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Restricted cash | 11,348,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 22,366,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Goodwill | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Other intangible assets, net | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Total assets (5) | 4,708,744,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] | 3,731,139,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | [1] |  |
Unearned premiums | 657,555,000 us-gaap_UnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 580,453,000 us-gaap_UnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Reserve for losses and LAE | 1,384,714,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,893,960,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 1,560,032,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember | 2,164,353,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember
New Insurance Written | 9,385,000,000 rdn_NewInsuranceWritten / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  | 6,808,000,000 rdn_NewInsuranceWritten / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |
Costs and Expenses, Related Party | 900,000 us-gaap_CostsAndExpensesRelatedParty / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember |  |  |  |  |
Mortgage and Real Estate Services Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net premiums written—insurance | 0 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Increase in unearned premiums | 0 us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Net premiums earned-insurance | 0 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Services revenue | 30,742,000 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |  |  |
Net investment income | 0 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [3] | 0 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4] |  |
Other income | 790,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [3] | 130,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4] |  |
Revenue Non GAAP Basis | 31,532,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [5] | 130,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [6] |  |
Provision for losses | 0 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Change In Present Value of Estimated Credit Loss Payments |  |  | 0 rdn_ChangeInPresentValueofEstimatedCreditLossPayments / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Policy acquisition costs | 0 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Direct cost of services | 18,451,000 us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |  |  |
Other operating expenses before corporate allocations (3) | 9,659,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [7] | 859,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Total Expenses Non-GAAP | 28,110,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [8] | 859,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Adjusted pretax operating income before corporate allocations | 3,422,000 rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | (729,000)rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Allocation of corporate operating expenses (1) | 981,000 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [3] | 0 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4] |  |
Allocation of interest expense (1) | 4,432,000 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [3] | 0 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [4] |  |
Adjusted pretax operating income (loss) | (1,991,000)rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [11] | (729,000)rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [11] |  |
Cash and investments | 9,437,000 us-gaap_InvestmentsAndCash / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 24,000 us-gaap_InvestmentsAndCash / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Restricted cash | 2,872,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Goodwill | 194,246,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 2,095,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 191,932,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | 2,095,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember
Other intangible assets, net | 99,552,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 188,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Total assets (5) | 349,238,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [1] | 2,661,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember | [1] |  |
Unearned premiums | 0 us-gaap_UnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_UnearnedPremiums / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Reserve for losses and LAE | 0 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  | 0 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |
Revenue from Related Parties | 900,000 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageandRealEstateServicesSegmentMember |  |  |  |  |
Mortgage Insurance and Mortgage and Real Estate Services Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net premiums written—insurance | 241,908,000 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 212,953,000 us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Increase in unearned premiums | (17,313,000)us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | (14,191,000)us-gaap_IncreaseDecreaseInUnearnedPremiumsNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Net premiums earned-insurance | 224,595,000 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 198,762,000 us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Services revenue | 30,742,000 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |  |  |
Net investment income | 17,328,000 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [3] | 15,318,000 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [4] |  |
Other income | 2,121,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [3] | 1,126,000 us-gaap_OtherIncome / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [4] |  |
Revenue Non GAAP Basis | 274,786,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [5] | 215,206,000 rdn_RevenueNonGAAPBasis / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [6] |  |
Provision for losses | 45,851,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 49,626,000 rdn_PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Change In Present Value of Estimated Credit Loss Payments |  |  | (139,000)rdn_ChangeInPresentValueofEstimatedCreditLossPayments / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Policy acquisition costs | 7,750,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 7,017,000 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Direct cost of services | 18,451,000 us-gaap_CostOfServices / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |  |  |
Other operating expenses before corporate allocations (3) | 43,709,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [7] | 38,623,000 us-gaap_OtherCostAndExpenseOperating / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Total Expenses Non-GAAP | 115,761,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [8] | 95,405,000 rdn_TotalExpensesNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Adjusted pretax operating income before corporate allocations | 159,025,000 rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 119,801,000 rdn_OperatingIncomeLossPretaxNonGAAPBeforeCorporateAllocations / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Allocation of corporate operating expenses (1) | 10,739,000 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [3] | 15,884,000 rdn_TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [4] |  |
Allocation of interest expense (1) | 24,385,000 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [3] | 19,927,000 rdn_TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember | [4] |  |
Adjusted pretax operating income (loss) | 123,901,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  | 83,990,000 rdn_OperatingIncomeLossPreTaxNonGAAP / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceandMortgageandRealEstateServicesSegmentsMember |  |  |
Operating Expense [Member] | Continuing Operations [Member] | Mortgage Insurance Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment Reporting, Previously Allocated Income (Expense) to Discontinued Operations | (2,100,000)rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  | (4,100,000)rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |
Interest Expense [Member] | Continuing Operations [Member] | Mortgage Insurance Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment Reporting, Previously Allocated Income (Expense) to Discontinued Operations | (9,900,000)rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  | (14,600,000)rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |
Investment Income [Member] | Continuing Operations [Member] | Mortgage Insurance Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment Reporting, Previously Allocated Income (Expense) to Discontinued Operations | 900,000 rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  | 1,300,000 rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |
Other Income [Member] | Continuing Operations [Member] | Mortgage Insurance Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment Reporting, Previously Allocated Income (Expense) to Discontinued Operations |  |  | $ 100,000 rdn_SegmentReportingPreviouslyAllocatedIncomeExpensetoDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_StatementBusinessSegmentsAxis = rdn_MortgageInsuranceSegmentMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |
[1] | Assets held for sale are not part of the Mortgage Insurance or Services segments.
[2] | The change in expected economic loss or recovery associated with our consolidated VIEs is included in adjusted pretax operating income above. Therefore, for purposes of this reconciliation, net gains on investments and other financial instruments has been adjusted by $0.1 million for the three months ended March 31, 2014 to reverse this item, which represents an amount that is not included in net income.
[3] | Includes certain corporate income and expenses that have been reallocated to the Mortgage Insurance segment that were previously allocated to the former financial guaranty segment, but were not reclassified to discontinued operations. These items include net investment income of $0.9 million, corporate overhead expenses of $2.1 million and interest expense of $9.9 million.
[4] | Includes certain corporate income and expenses that have been reallocated to the Mortgage Insurance segment that were previously allocated to the former financial guaranty segment, but were not reclassified to discontinued operations. These items include net investment income of $1.3 million, other income of $0.1 million, corporate overhead expenses of $4.1 million and interest expense of $14.6 million
[5] | Excludes net gains on investments and other financial instruments of $16.8 million, not included in adjusted pretax operating income. Includes inter-segment revenues of $0.9 million in the Services segment.
[6] | Excludes net gains on investments and other financial instruments of $43.1 million, not included in adjusted pretax operating income.
[7] | Excludes $0.2 million of acquisition-related expenses not included in segment other operating expenses.
[8] | Includes inter-segment expenses of $0.9 million in the Mortgage Insurance segment.
[9] | Includes inter-segment expenses of $0.9 million for the three months ended March 31, 2015.
[10] | Includes certain corporate income and expenses that have been reallocated to the Mortgage Insurance segment for all periods presented, as listed in the preceding detailed tables. These amounts represent items that were previously allocated to the former financial guaranty segment, but were not reclassified to discontinued operations.
[11] | Includes inter-segment revenues of $0.9 million for the three months ended March 31, 2015.

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