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Note 18 - Statutory Information Statutory Dividend Restrictions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restricted Net Assets Held by Consolidated Subsidiaries | $ 4,200,000 |  |
Radian Guaranty |  |  |
Statutory Unassigned Negative Surplus | 503,300 |  |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | 0 |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Additions | 0 | $ 0 | $ 100,000
Statutory Accounting Practices, Statutory Capital and Surplus, Distributions | (375,000) | (450,000) | (175,000)
Radian Reinsurance |  |  |
Statutory Unassigned Negative Surplus | 50,400 |  |
Other MI Companies |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Additions | 65,400 | 30,300 | 175,200
Statutory Accounting Practices, Statutory Capital and Surplus, Distributions | $ (14,000) | $ 0 | $ 0

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- Definition The amount of the entity's restricted net assets which are held by consolidated subsidiaries (entity's investment in subsidiaries). + References No definition available. + Details
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Balance Type: | debit
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- Definition Statutory Accounting Practices, Statutory Capital and Surplus, Additions + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
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- Definition Statutory Accounting Practices, Statutory Capital and Surplus, Distributions + References No definition available. + Details
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- Definition Statutory Unassigned Negative Surplus + References No definition available. + Details
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Namespace Prefix: | rdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Details
Name: | dei_LegalEntityAxis=rdn_RadianGuarantyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=rdn_RadianReinsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=rdn_OtherMICompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |