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Note 1 - Description of Business and Recent Developments Current Year Developments (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Aug. 16, 2018
Aug. 09, 2017
Period That Company Incurred Restructuring and Other Exit Costs Related to Services Segment                     2 years          
Restructuring Charges                     $ 2,500 $ 17,300   $ 19,800    
Payments for Restructuring                     2,000 6,800        
Restructuring and other exit costs   $ 113 $ 4,464 $ 925 $ 551 $ 5,230 $ 12,038 $ 0 $ 0   6,053 $ 17,268 $ 0      
Third Quarter 2017 Repurchase Program                                
Stock Repurchase Program, Authorized Amount                               $ 50,000
Stock Repurchased During Period, Shares                   3.0            
Accelerated Share Repurchases, Final Price Paid Per Share                   $ 16.56            
Third Quarter 2018 Repurchase Program                                
Stock Repurchase Program, Authorized Amount                             $ 100,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   100,000                 100,000     100,000    
Asset Impairment Charges                                
Restructuring Charges                           10,800    
Restructuring and other exit costs                     4,000          
Employee Severance and Benefit Costs                                
Restructuring Charges                           7,400    
Facility and Lease Termination Costs                                
Restructuring Charges                           1,300    
Contract Termination and Other Restructuring Costs                                
Restructuring Charges                           300    
Impairments of Internal-Use Software                                
Restructuring and other exit costs                     3,600          
Internal Revenue Service (IRS) | REMIC Residual                                
Income Tax Expense (Benefit) Recorded as a Result of Finalized IRS Settlement       $ (73,600)                        
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Submitted   31,000                 31,000     31,000    
Qualified Deposit Assets With The U.S. Department Of Treasury Expected to be Refunded   58,000                 58,000     58,000    
Mortgage Insurance Segment                                
Restructuring and other exit costs [1]                     0          
Risk In Force   $ 56,700,000                 $ 56,700,000     $ 56,700,000    
Mortgage Insurance Segment | Eagle Re | Radian Guaranty                                
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 434,000                              
Risk In Force 9,100,000                              
Mortgage Insurance Segment | Separate Third-Party Reinsurer | Radian Guaranty                                
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 21,400                              
[1] Does not include impairment of long-lived assets and loss from the sale of a business line, which are not components of adjusted pretax operating income.