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Note 10 - Long-Term Debt Interest Expense Recognized Related to Convertible Debt (Details) (Convertible Debt [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Convertible Senior Notes Due 2017 |  |
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items] |  |
Contractual interest expense of convertible debt | $ 3,375 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 3,375 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Amortization of debt issuance costs | 318 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 300 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Amortization of debt discount | 5,708 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 5,186 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Total interest expense for convertible debt | 9,401 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 8,861 us-gaap_InterestExpenseDebt / 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 | 9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Convertible Senior Notes Due 2019 |  |
Schedule of Interest Expense Recognized Related to Convertible Debt [Line Items] |  |
Contractual interest expense of convertible debt | 2,250 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 2,250 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Amortization of debt issuance costs | 328 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 316 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Amortization of debt discount | 3,073 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 2,889 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Total interest expense for convertible debt | $ 5,651 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 5,455 us-gaap_InterestExpenseDebt / 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 | 6.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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