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Note 15 - Share-Based and Other Compensation Plans (RSUs - Cash Settled) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Timed-Vested RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
2014 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 702,180us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
   
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 170,176us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
   
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 85,133us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_KeyEmployeeMember
   
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 85,043us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_NonEmployeeDirectorsMember
   
2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   435,970us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
 
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   102,618us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
 
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   13,260us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_KeyEmployeeMember
 
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   89,358us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_NonEmployeeDirectorsMember
 
2012 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
2012 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     558,216us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
2012 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     7,812us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_KeyEmployeeMember
2012 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     550,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
/ us-gaap_TitleOfIndividualAxis
= rdn_NonEmployeeDirectorsMember
Equity Compensation Plan, 2008 [Member] | Stock Appreciation Rights (SARs) [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage of Total Award, Third Anniversary 50.00%rdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageOfTotalAwardThirdAnniversary
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage of Total Award, Fourth Anniversary 50.00%rdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentageOfTotalAwardFourthAnniversary
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Equity Compensation Plan, 2008 [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years 3 years 3 years
Equity Compensation Plan, 2008 [Member] | 2014 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Equity Compensation Plan, 2008 [Member] | 2014 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee 1,470us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2014AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
 
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years)   3 years  
Maximum Payout Percentage of Target Award   200.00%rdn_ShareBasedCompensationMaximumPayoutPercentageOfTargetAward
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
 
Share Based Compensation, Maximum Multiplier for Target Payout   6rdn_ShareBasedCompensationMaximumMultiplierforTargetPayout
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
 
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Maximum [Member] | Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Payout Percentage of Target Award When Absolute TSR is Negative   50.00%rdn_ShareBasedCompensationPayoutPercentageOfTargetAwardWhenAbsoluteTsrIsNegative
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
 
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee   7,670us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2013AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
 
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     2,211,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
Award Requisite Service Period 3 years    
Vesting period (in years) 3 years    
Maximum Payout Percentage of Target Award 200.00%rdn_ShareBasedCompensationMaximumPayoutPercentageOfTargetAward
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested Shares Based on Performance When TSR is Negative 0rdn_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedSharesBasedonPerformanceWhenTSRisNegative
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Grant Price 0.00rdn_ShareBasedCompensationArrangementEquityInstrumentsOtherThanOptionsGrantPrice
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
   
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants by Compensation Committee     151,154us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardDateAxis
= rdn_A2012AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_TimedVestedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
Equity Compensation Plan, 2008 [Member] | 2011 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Maximum Payout Percentage of Target Award 200.00%rdn_ShareBasedCompensationMaximumPayoutPercentageOfTargetAward
/ us-gaap_AwardDateAxis
= rdn_A2011AwardYearMember
/ us-gaap_AwardTypeAxis
= rdn_PerformanceBasedRsusMember
/ us-gaap_PlanNameAxis
= rdn_EquityCompensationPlan2008Member
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember