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Note 15 - Share-Based and Other Compensation Plans (Awards Summary - Tables) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized $ 43,011us-gaap_AllocatedShareBasedCompensationExpense [1] $ 94,981us-gaap_AllocatedShareBasedCompensationExpense [1] $ 28,366us-gaap_AllocatedShareBasedCompensationExpense [1]
Less: Costs deferred as acquisition costs 1,047rdn_ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost 1,769rdn_ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost 465rdn_ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost
Stock-based compensation expense impact on net loss before income taxes - increase 41,964rdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes 93,212rdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes 27,901rdn_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Options, Equity Instruments Outstanding 3,029,348us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 3,989,641us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		  
Cash Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Liability Recorded 65,752us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 112,309us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 30,766us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
Share-based Compensation Programs, Compensation Cost Recognized 32,749us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 87,866us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 24,799us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1]
Cash Settled [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Liability Recorded 65,157us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 104,114us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 26,164us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
Share-based Compensation Programs, Compensation Cost Recognized 31,834us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 79,322us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 21,301us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1]
Cash Settled [Member] | Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Liability Recorded 595us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 8,195us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 4,602us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember
Share-based Compensation Programs, Compensation Cost Recognized 915us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 8,544us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1] 3,498us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_CashSettledMember		 [1]
Equity Settled [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized 10,262us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 7,115us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 3,567us-gaap_AllocatedShareBasedCompensationExpense
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Equity Settled [Member] | Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized 267us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 267us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 253us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Equity Settled [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized 7,461us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 4,336us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 1,466us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 2,056,596us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 1,273,556us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 990,881us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
Equity Settled [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized 2,531us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 2,488us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 1,787us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Share-based Compensation Programs, Options, Equity Instruments Outstanding 3,029,348us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 3,989,641us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 4,402,344us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
Equity Settled [Member] | Phantom Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized 3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 284,645us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 284,645us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 343,094us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= rdn_PhantomStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
Equity Settled [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Programs, Compensation Cost Recognized $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] $ 21us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1] $ 57us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember		 131,374us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ rdn_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardSettlementTypeAxis
= rdn_EquitySettledMember
[1] For purposes of calculating compensation cost recognized, we generally consider time-vested awards effectively vested (and we recognize the full compensation costs) when grantees become retirement eligible. However, under the terms of our stock option awards granted in 2014, 2013, and 2012, legal vesting for retirement occurs when the grantee actually separates from service, with the exception of certain senior executives for whom vesting remains dependent on the stock price hurdle being met regardless of when the executive separates from service. Performance-based RSU awards granted in 2014, 2013, and 2012 provide that vesting remains dependent on the Company’s performance for the full term of the awards notwithstanding the grantee’s earlier retirement.