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Note 10 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,218,972 us-gaap_LongTermDebt |  | $ 1,209,926 us-gaap_LongTermDebt |
Senior Notes Due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2017Member |  |  |
Long-term debt | 192,870 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2017Member |  | 192,605 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2017Member |
Convertible Senior Notes Due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member |  |  |
Long-term debt | 381,018 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member | [1] | 375,310 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member | [1]
Convertible Senior Notes Due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member |  |  |
Long-term debt | 345,084 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member | [2] | 342,011 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member | [2]
Senior Notes Due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2019Member |  |  |
Long-term debt | 300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2019Member |  | 300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_SeniorNotesDue2019Member |
Total Long Term Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 1,218,972 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_TotalLongTermDebtMember |  | 1,209,926 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_TotalLongTermDebtMember |
Convertible Debt [Member] | Convertible Senior Notes Due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 381,018 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | 375,310 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Long-term Debt, Gross | 450,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | 450,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2017Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Convertible Debt [Member] | Convertible Senior Notes Due 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 345,084 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | 342,011 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Long-term Debt, Gross | $ 400,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  | $ 400,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rdn_ConvertibleSeniorNotesDue2019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
[1] | The principal amount of these notes is $450 million.
[2] | The principal amount of these notes is $400 million.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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