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Note 6 - Investments Schedule of Contractual Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities, Amortized Cost    
Amortized cost $ 528,660us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 35,511us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value 536,890us-gaap_AvailableForSaleSecuritiesDebtSecurities 35,145us-gaap_AvailableForSaleSecuritiesDebtSecurities
Debt Securities    
Available-for-sale Securities, Amortized Cost    
Amortized cost 528,660us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Available-for-sale Securities, Fair Value    
Fixed-maturities available for sale—at fair value 536,890us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_DebtSecuritiesMember		  
Non Asset Backed Security Investments, Contractual Maturities    
Available-for-sale Securities, Amortized Cost    
Due in one year or less 2,247us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after one year through five years 39,483us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after five years through ten years 154,234us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after ten years 124,451us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Available-for-sale Securities, Fair Value    
Due in one year or less 2,295us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after one year through five years 39,420us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after five years through ten years 155,790us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
Due after ten years 130,930us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_DebtSecurityAxis
= rdn_NonAssetBackedSecurityInvestmentsContractualMaturitiesMember		 [1]  
RMBS    
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 41,467us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 42,520us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember		 [2]  
CMBS    
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 57,358us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 58,234us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 [2]  
Other ABS    
Available-for-sale Securities, Fair Value    
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 109,420us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 107,701us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_AssetBackedSecuritiesMember		 [2]  
[1] Actual maturities may differ as a result of calls before scheduled maturity.
[2] RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.