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Note 1 - Description of Business and Recent Developments Organization, Consolidation and Presentation of Financial Statements (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 15 Months Ended 18 Months Ended 24 Months Ended 33 Months Ended 36 Months Ended
Dec. 31, 2017
USD ($)
Jan. 27, 2017
USD ($)
Apr. 01, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2013
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Oct. 16, 2017
USD ($)
Aug. 09, 2017
USD ($)
Insurance Regulatory Capital Requirements [Abstract]                                      
Number of Reportable Segments | segment                   2                  
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges         $ 5,230 $ 12,038 $ 0 $ 0   $ 17,268 $ 0 $ 0              
Payments for Restructuring                   6,800                  
Goodwill, Impairment Loss         0 0 184,374 $ 0   184,374 0 0              
Finite-Lived Intangible Assets, Net $ 53,290       $ 53,290         $ 53,290 81,058       $ 53,290   $ 53,290    
Mortgage Insurance Segment                                      
Insurance Regulatory Capital Requirements [Abstract]                                      
Private Mortgage Insurance Protects Lenders For Loans Made With This Maximum Downpayment Percentage 20.00%       20.00%         20.00%         20.00%   20.00%    
Private Mortgage Insurance Protects Lenders For Refinancings Made to Home Buyers With Less Than This Maximum Equity-Ownership Percentage 20.00%       20.00%         20.00%         20.00%   20.00%    
Risk In Force $ 51,300,000       $ 51,300,000         $ 51,300,000         $ 51,300,000   $ 51,300,000    
Mortgage and Real Estate Services Segment [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges [1]                   6,828                  
Goodwill, Impairment Loss             184,400     184,374 0                
Impairment of Intangible Assets, Finite-lived             15,800                        
Goodwill 10,922       10,922         10,922 195,170 $ 195,170     10,922 $ 195,170 10,922    
Discontinued Operations, Disposed of by Sale [Member] | Radian Asset Assurance [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Sale of Stock, Percentage of Ownership before Transaction     100.00%                                
Disposal Group, Including Discontinued Operation, Consideration     $ 810,000                                
Equity Method Investment, Net Sales Proceeds     $ 789,000                                
Convertible Senior Notes Due 2017 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Repayments of Convertible Debt       $ 126,800     31,600                        
Gain (Loss) on Repurchase of Debt Instrument       $ (91,900)                              
Convertible Senior Notes Due 2019 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount   $ 68,000                                  
Repayments of Convertible Debt   110,100                                  
Gain (Loss) on Repurchase of Debt Instrument   $ (4,500)                                  
Senior Notes due 2019, 2020, and 2021 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Repayments of Senior Debt           450,800                          
Revolving Credit Facility [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Line of Credit Facility, Current Borrowing Capacity                                   $ 225,000  
Convertible Debt [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Repayments of Convertible Debt                     235,000                
Gain (Loss) on Repurchase of Debt Instrument                     (60,100)                
Convertible Debt [Member] | Convertible Senior Notes Due 2017 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount             21,600       30,100                
Gain (Loss) on Repurchase of Debt Instrument             $ (1,200)                        
Convertible Debt [Member] | Convertible Senior Notes Due 2019 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount                     322,000                
Senior Notes [Member] | Senior Notes Due 2019 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount           141,400                          
Senior Notes [Member] | Senior Notes Due 2020 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount           115,900                          
Senior Notes [Member] | Senior Notes Due 2021 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Debt Instrument, Repurchased Face Amount           152,300                          
Senior Notes [Member] | Senior Notes due 2019, 2020, and 2021 [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Gain (Loss) on Repurchase of Debt Instrument           $ (45,800)                          
Third Quarter 2017 Repurchase Program [Member]                                      
Basis of Presentation and Business Overview [Line Items]                                      
Stock Repurchase Program, Authorized Amount                                     $ 50,000
Scenario, Forecast [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges                 $ 3,800         $ 21,100          
Payments for Restructuring                 $ 3,000                    
Contract Termination and Other Restructuring Costs [Member] | Scenario, Forecast [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges                           900          
Asset Impairment Charges [Member] | Scenario, Forecast [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges                           11,300          
Employee Severance and Benefit Costs [Member] | Scenario, Forecast [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges                           7,100          
Facility and Lease Termination Costs [Member] | Scenario, Forecast [Member]                                      
Financial Guaranty and Discontinued Operations [Abstract]                                      
Restructuring Charges                           $ 1,800          
Radian Guaranty [Member] | Reinsurer Concentration Risk [Member] | Single Premium QSR Transaction [Member]                                      
Insurance Regulatory Capital Requirements [Abstract]                                      
Risk In Force $ 6,900,000       $ 6,900,000         $ 6,900,000 $ 3,800,000       $ 6,900,000   $ 6,900,000    
Financial Guaranty and Discontinued Operations [Abstract]                                      
Concentration Risk, Percentage 65.00%                       20.00%   35.00% 35.00% 35.00%    
[1] Primarily includes employee severance and related benefit costs. Does not include impairment of long-lived assets, which is not a component of adjusted pretax operating income.