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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation and Business Overview Capital and Liquidity (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2015 | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) segment | Sep. 30, 2014 USD ($) | Jun. 18, 2015 USD ($) | Dec. 31, 2014 USD ($)
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities, continuing operations |  |  |  |  | $ 666 |  | $ (5,993) | $ (192,271) |  |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  | 1,759 |  | 1,759 | 29,891 |  |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  | 4,999 |  | (4,999) | (161,070) |  |
Cash and Cash Equivalents, Period Increase (Decrease) Including Discontinued Operations |  |  |  |  | 29,979 |  | 38,144 | 8,050 |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  | (3,240) |  | $ (421) | 439 |  |
Business Overview [Abstract] |  |  |  |  |  |  |  |  |  |
Number of Operating Segments | segment |  |  |  |  |  |  | 2 |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 202,000 |
Loss on Repurchase of Debt Instrument |  |  |  | $ 11 |  | $ 0 | $ 91,887 | $ 0 |  |
Mortgage Insurance Segment |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage |  |  |  | 20.00% |  |  | 20.00% |  |  |
Percentage Of Primary Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  |  | 97.30% |  |  | 97.30% |  |  |
First Lien Primary Mortgage Insurance Risk In Force |  |  |  | $ 45,600,000 |  |  | $ 45,600,000 |  |  |
Percentage Of Pool Insurance On Domestic First-Lien Mortgages To Total Risk In Force |  |  |  | 2.50% |  |  | 2.50% |  |  |
Bank of America Settlement Agreement [Member] | Mortgage Insurance Segment |  |  |  |  |  |  |  |  |  |
BAC Settlement Agreement [Abstract] |  |  |  |  |  |  |  |  |  |
Loss Contingency, Settlement Agreement, Percentage of Subject Loans Not Held by Insureds or Are Non-GSE Investors |  |  |  | 12.00% |  |  | 12.00% |  |  |
Sale of Radian Asset Assurance [Member] | Parent Company |  |  |  |  |  |  |  |  |  |
Business Overview [Abstract] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Percentage of Ownership before Transaction |  | 100.00% |  |  |  |  |  |  |  |
Senior Notes Due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  | $ 350,000 |  |  |  |  |  |  |
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | [1] |  |  | $ 408 |  |  | $ 408 |  |  | $ 3,974
Mortgage Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Long-term debt, Gross |  |  |  | $ 60,899 |  |  | $ 60,899 |  |  | 450,000
Extinguishment of Debt, Amount |  |  | 389,100 |  |  |  |  |  |  |
Loss on Repurchase of Debt Instrument |  |  | $ 91,900 |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  |  |  |  |  |  | 17,627
New Accounting Pronouncement, Early Adoption, Effect [Member] | Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  |  |  |  |  |  |  |  |  | $ 3,974
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
Basis of Presentation and Business Overview [Line Items] |  |  |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities, continuing operations |  |  |  |  | 80 |  |  |  |  |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  | 12,168 |  |  |  |  |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  | 9,514 |  |  |  |  |
Cash and Cash Equivalents, Period Increase (Decrease) Including Discontinued Operations |  |  |  |  | 23,499 |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  | $ (3,240) |  |  |  |  |
[1] | Included within long-term debt and is being amortized over the life of the convertible notes.

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