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Note 10 - Income Taxes - IRS Matter (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Internal Revenue Service (IRS) |
Income Tax Examination [Line Items] |
Income Tax Expense (Benefit) Recorded as a Result of Finalized IRS Settlement | $ 73,600

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- Definition Income Tax Expense (Benefit) Recorded as a Result of Finalized IRS Settlement + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |