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Note 11 - Losses and Loss Adjustment Expenses Claims Development (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
transaction
default
Dec. 31, 2016
USD ($)
default
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Claims Development [Line Items]                    
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction 2                  
Primary Mortgage Product [Member] | Mortgage Insurance Segment                    
Claims Development [Line Items]                    
Default To Claim Rate Estimate, Gross, For New Defaults 10.00% 12.00% 13.00% 16.00%            
Default To Claim Rate Estimate, Gross, For Pre-Foreclosure Stage Defaults 62.00% 62.00%                
Weighted Average Default To Claim Rate Assumption Excluding Pending Claims Net Of Denials And Rescissions 29.00% 40.00%                
Default To Claim Estimate, Gross, For Foreclosure Stage Defaults 81.00% 81.00%                
Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,859,437                  
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 8,329,856                  
Property, Liability and Casualty Insurance Product Line [Member] | Mortgage Insurance Segment                    
Claims Development [Line Items]                    
Liability for Unpaid Claims and Claims Adjustment Expense, Net [1] 485,911                  
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,088,124 $ 2,051,495 $ 2,022,019 $ 1,932,283 $ 1,872,804 $ 1,744,559 $ 1,635,069 $ 1,297,867 $ 740,578 $ 189,458
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 2,122,647 2,115,083 2,110,922 2,088,719 2,074,295 2,018,794 2,009,551 1,969,581 1,715,144 $ 1,957,510
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 2,370                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 215,837,000                  
Short-duration Insurance Contracts, Accident Year 2009 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 1,986,076 1,958,660 1,921,134 1,807,031 1,711,019 1,471,264 1,236,210 619,496 136,413  
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 2,022,629 2,018,907 2,016,412 1,991,796 1,974,568 1,939,479 1,930,263 1,894,783 $ 1,671,239  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 1,535                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 213,836,000                  
Short-duration Insurance Contracts, Accident Year 2010 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 1,198,031 1,178,546 1,145,497 1,055,935 956,598 700,316 394,278 11,810    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,219,469 1,218,264 1,220,289 1,207,774 1,195,056 1,192,482 1,215,136 $ 1,102,856    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 958                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 146,324,000                  
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 1,038,582 1,016,855 982,830 892,959 756,820 323,216 40,392      
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,059,116 1,061,161 1,062,579 1,050,555 1,052,277 1,152,016 $ 1,058,625      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 904                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 118,972,000                  
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 692,291 672,271 631,982 528,744 295,332 19,200        
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 714,783 715,646 720,502 711,213 763,969 $ 803,831        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 756                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 89,845,000                  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 379,036 357,087 307,361 191,040 34,504          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 402,259 404,333 401,444 405,334 $ 505,732          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 653                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 71,749,000                  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 233,607 200,422 115,852 13,108            
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 264,620 265,891 247,074 $ 337,784            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 776                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 58,215,000                  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 142,421 84,271 10,479              
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 178,042 198,186 $ 222,555              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 874                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 49,825,000                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 76,616 11,061                
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 165,440 $ 201,016                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 2,185                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 46,264,000                  
Short-duration Insurance Contracts, Accident Year Prior to 2007 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 15,492                  
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 24,653                  
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 180,851                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 2,672                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 47,283,000                  
Hurricanes Harvey and Irma [Member] | Primary Mortgage Product [Member] | Mortgage Insurance Segment                    
Claims Development [Line Items]                    
Default To Claim Rate Estimate, Gross, For New Defaults 3.00%                  
Hurricanes Harvey and Irma [Member] | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 8,862 3,852                
Indirect Guarantee of Indebtedness [Member]                    
Claims Development [Line Items]                    
Number of Guaranteed Structured Transactions For Radian Guaranty | transaction 2                  
[1] Calculated as follows:(In thousands) Incurred losses, net of reinsurance$8,329,856Add: All outstanding liabilities before 2008, net of reinsurance15,492Less: Cumulative paid claims, net of reinsurance7,859,437Liabilities for claims, net of reinsurance$485,911
[2] Represents reserves as of December 31, 2017 related to IBNR liabilities.
[3] Represents total number of new default notices received in each calendar year as compiled monthly based on reports received from loan servicers. As reflected in our Default to Claim Rate assumptions, a significant portion of reported defaults generally do not result in a claim. In certain instances, a defaulted loan may cure, and then re-default in a later period. Consistent with our reserving practice, each new event of default is treated as a unique occurrence and therefore certain loans that cure and re-default may be included as a reported default in multiple periods. Included in this amount for the year ended December 31, 2017 and December 31, 2016 are 8,862 and 3,852 notices, respectively, of new primary defaults related to the FEMA Designated Areas associated with Hurricanes Harvey and Irma.