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Note 1 - Condensed Consolidated Financial Statements - Basis of Presentation and Business Overview Capital and Liquidity (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2015
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Jun. 18, 2015
USD ($)
Dec. 31, 2014
USD ($)
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   $ 91,876 $ 0 $ 91,876 $ 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   97.40%   97.40%      
First Lien Primary Mortgage Insurance Risk In Force   $ 44,800,000   $ 44,800,000      
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   $ 350,000      
Convertible Senior Notes Due 2017              
Basis of Presentation and Business Overview [Line Items]              
Unamortized Debt Issuance Expense [1]   451   451     $ 3,974
Mortgage Insurance [Abstract]              
Long-term debt, Gross   60,914   $ 60,914     450,000
Extinguishment of Debt, Amount   389,100          
Loss on Repurchase of Debt Instrument   $ 91,876          
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
[1] Included within long-term debt and is being amortized over the life of the convertible notes.