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Schedule II Financial Information of Registrant Parent Company Only Financial Information (Details) (USD $)
12 Months Ended 2 Months Ended 10 Months Ended 8 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2013
Dec. 31, 2014
basispoint
Feb. 28, 2014
Feb. 28, 2015
May 31, 2014
Mar. 31, 2013
Dec. 22, 2014
Jun. 30, 2005
Jun. 01, 2005
Nov. 30, 2010
Nov. 15, 2010
Condensed Financial Statements, Captions [Line Items]                              
Short-term investments—at fair value $ 1,300,872,000us-gaap_OtherShortTermInvestments $ 935,852,000us-gaap_OtherShortTermInvestments     $ 935,852,000us-gaap_OtherShortTermInvestments $ 1,300,872,000us-gaap_OtherShortTermInvestments                  
Supplemental Notes [Abstract]                              
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries   7,600,000us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries                          
Repayments of Long-term Debt 57,223,000us-gaap_RepaymentsOfLongTermDebt 79,372,000us-gaap_RepaymentsOfLongTermDebt 153,261,000us-gaap_RepaymentsOfLongTermDebt                        
Issuance of common stock 247,188,000us-gaap_ProceedsFromIssuanceOfCommonStock 299,410,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock                        
Senior Notes Due 2017                              
Supplemental Notes [Abstract]                              
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
    9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
                   
Senior Notes Due 2015                              
Supplemental Notes [Abstract]                              
Debt Instrument, Face Amount                         250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2015Member
   
Debt Instrument, Interest Rate, Stated Percentage                       5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2015Member
     
Gains (Losses) on Extinguishment of Debt (2,800,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2015Member
                           
Repayments of Long-term Debt 57,200,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2015Member
                           
Convertible Senior Notes Due 2017                              
Supplemental Notes [Abstract]                              
Debt Instrument, Interest Rate, Stated Percentage                           3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
 
Convertible Senior Notes Due 2017 | Convertible Debt [Member]                              
Supplemental Notes [Abstract]                              
Debt Instrument, Face Amount                             450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Debt Instrument, Interest Rate, Stated Percentage                           3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Proceeds/payments related to issuance or exchange of debt, net       391,300,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                     
Debt Instrument, Interest Rate, Effective Percentage                           9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Long-term Debt, Gross 450,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
450,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
    450,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
450,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                 
Convertible Senior Notes Due 2019                              
Supplemental Notes [Abstract]                              
Debt Instrument, Interest Rate, Stated Percentage                   2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
         
Convertible Senior Notes Due 2019 | Convertible Debt [Member]                              
Supplemental Notes [Abstract]                              
Debt Instrument, Face Amount                   400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
         
Debt Instrument, Interest Rate, Stated Percentage                   2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
         
Proceeds/payments related to issuance or exchange of debt, net         389,800,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                   
Debt Instrument, Interest Rate, Effective Percentage                   6.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
         
Long-term Debt, Gross 400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
    400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
400,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= rdn_ConvertibleSeniorNotesDue2019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
                 
Senior Notes Due 2019 [Member]                              
Supplemental Notes [Abstract]                              
Debt Instrument, Face Amount                 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
           
Debt Instrument, Interest Rate, Stated Percentage                 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
           
Debt Instrument, Redemption Price, Percentage           100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
                 
Number of Basis Points Added to Treasury Rate Used in Calculating Redemption Price of Debt 50rdn_NumberofBasisPointsAddedtoTreasuryRateUsedinCalculatingRedemptionPriceofDebt
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
        50rdn_NumberofBasisPointsAddedtoTreasuryRateUsedinCalculatingRedemptionPriceofDebt
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
                 
Proceeds/payments related to issuance or exchange of debt, net           293,800,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2019Member
                 
Parent Company                              
Condensed Financial Statements, Captions [Line Items]                              
Short-term investments—at fair value 631,934,000us-gaap_OtherShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
633,178,000us-gaap_OtherShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
    633,178,000us-gaap_OtherShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
631,934,000us-gaap_OtherShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Interest Income, Related Party 8,900,000us-gaap_InterestIncomeRelatedParty
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                           
Notes Receivable, Related Parties 300,000,000us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
        300,000,000us-gaap_NotesReceivableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Supplemental Notes [Abstract]                              
Restricted Funds Included In Short Term Investments 45,100,000rdn_RestrictedFundsIncludedInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
41,600,000rdn_RestrictedFundsIncludedInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
    41,600,000rdn_RestrictedFundsIncludedInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
45,100,000rdn_RestrictedFundsIncludedInShortTermInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Restricted Cash Held As Collateral For Insurance Trust Agreement 100,000rdn_RestrictedCashHeldAsCollateralForInsuranceTrustAgreement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
100,000rdn_RestrictedCashHeldAsCollateralForInsuranceTrustAgreement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
    100,000rdn_RestrictedCashHeldAsCollateralForInsuranceTrustAgreement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
100,000rdn_RestrictedCashHeldAsCollateralForInsuranceTrustAgreement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Total Operating Expenses and Interest Expense Allocated to Subsidiaries From Parent Company 92,500,000rdn_TotalOperatingExpensesAndInterestExpenseAllocatedToSubsidiariesFromParentCompany
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
140,000,000rdn_TotalOperatingExpensesAndInterestExpenseAllocatedToSubsidiariesFromParentCompany
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
93,200,000rdn_TotalOperatingExpensesAndInterestExpenseAllocatedToSubsidiariesFromParentCompany
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Tax Payments to Parent from Subsidiaries 8,800,000rdn_TaxPaymentsToParentFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
500,000rdn_TaxPaymentsToParentFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
36,800,000rdn_TaxPaymentsToParentFromSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Gains (Losses) on Extinguishment of Debt 2,785,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,952,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(16,175,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Repayments of Long-term Debt 57,223,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
79,372,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
153,261,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Issuance of common stock 247,188,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
299,410,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Long-term Debt, Maturities, Repayments of Principal in Year Four 645,501,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
        645,501,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Long-term Debt, Maturities, Repayments of Principal after Year Five 700,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
        700,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Long-term Debt, Gross 1,345,501,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
        1,345,501,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
Subsidiaries [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent 139,100,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
313,900,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
100,400,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
                       
Radian Guaranty [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent   230,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
100,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
      100,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
               
Cash Distributed From Parent to Consolidated Subsidiary   400,000rdn_ReimbursementofInterestExpensePaymenttoSubsidiaryfromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
300,000rdn_ReimbursementofInterestExpensePaymenttoSubsidiaryfromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
                       
RDN Investments [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent   80,500,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RDNInvestmentsMember
                         
Radian Mortgage Services [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent 20,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianMortgageServicesMember
2,900,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianMortgageServicesMember
                         
Radian Clayton Holdings Inc. [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent 19,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianClaytonHoldingsInc.Member
                           
Radian Mortgage Reinsurance [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent 100,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianMortgageReinsuranceMember
100,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianMortgageReinsuranceMember
100,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianMortgageReinsuranceMember
                       
Subsequent Event [Member] | Radian Guaranty [Member]                              
Supplemental Notes [Abstract]                              
Proceeds from Contributions from Parent               100,000,000us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= rdn_RadianGuarantyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
             
Debt Due 2015 Exchange | Senior Notes Due 2017                              
Supplemental Notes [Abstract]                              
Debt Instrument, Face Amount 195,500,000us-gaap_DebtInstrumentFaceAmount
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
        195,500,000us-gaap_DebtInstrumentFaceAmount
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
                 
Debt Instrument, Interest Rate, Stated Percentage   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
    9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
                   
Gains (Losses) on Extinguishment of Debt   (4,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2017Member
                         
Debt Due 2015 Exchange | Senior Notes Due 2015                              
Supplemental Notes [Abstract]                              
Redemption of long-term debt   195,500,000us-gaap_ExtinguishmentOfDebtAmount
/ rdn_CapitalAndLiquidityAxis
= rdn_DebtDue2015ExchangeMember
/ us-gaap_DebtInstrumentAxis
= rdn_SeniorNotesDue2015Member
                         
Common Stock                              
Supplemental Notes [Abstract]                              
Shares Issued, Price Per Share                 $ 14.50us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
           
Stock Issued During Period, Shares, New Issues                 17,825,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
39,100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
         
Sale of Stock, Price Per Share                 $ 14.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 8.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
         
Issuance of common stock         $ 299,400,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 247,200,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
                 
Sale of Radian Asset Assurance [Member]                              
Supplemental Notes [Abstract]                              
Sale of Stock, Percentage of Ownership before Transaction                     100.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= rdn_SaleofRadianAssetAssuranceMember
       
Sale of Radian Asset Assurance [Member] | Parent Company                              
Supplemental Notes [Abstract]                              
Sale of Stock, Percentage of Ownership before Transaction                     100.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= rdn_SaleofRadianAssetAssuranceMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember