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Note 11 - Losses and Loss Adjustment Expenses Claims Development (Details)
default in Thousands, $ in Thousands
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 ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Liability for Unpaid Claims and Claims Adjustment Expense, Net [1] $ 733,838                  
Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 9,377,232                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 8,670,721                  
Property, Liability and Casualty Insurance Product Line [Member] | Mortgage Insurance Segment                    
Claims Development [Line Items]                    
Liability for Unpaid Claims and Claims Adjustment Expense, Net 733,838                  
Short-duration Insurance Contracts, Accident Year 2007 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,178,745 $ 1,175,919 $ 1,174,723 $ 1,179,600 $ 1,135,617 $ 1,131,490 $ 1,126,173 $ 1,051,097 $ 1,211,075 $ 1,119,529
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 46,136                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 152,336                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,140,053 1,130,932 1,111,468 1,098,686 1,076,665 1,055,536 995,161 860,777 649,961 $ 100,435
Short-duration Insurance Contracts, Accident Year 2008 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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] $ 13,021                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 215,837                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 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, Accident Year 2009 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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] $ 1,896                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 213,836                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 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, Accident Year 2010 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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] $ 858                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 146,324                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,178,546 1,145,497 1,055,935 956,598 700,316 394,278 $ 11,810      
Short-duration Insurance Contracts, Accident Year 2011 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 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] $ 881                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 118,972                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,016,855 982,830 892,959 756,820 323,216 $ 40,392        
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 715,646 720,502 711,213 763,969 803,831          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 858                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 89,845                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 672,271 631,982 528,744 295,332 $ 19,200          
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 404,333 401,444 405,334 505,732            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 936                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 71,749                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 357,087 307,361 191,040 $ 34,504            
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 265,891 247,074 337,784              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 1,304                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 58,215                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 200,422 115,852 $ 13,108              
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 198,186 222,555                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 2,277                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 49,825                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 84,271 $ 10,479                
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Property, Liability and Casualty Insurance Product Line [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 201,016                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net [2] $ 3,540                  
Short-duration Insurance Contracts, Number of Reported Claims | default [3] 46,264                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 11,061                  
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, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 27,327                  
[1] Calculated as follows:(In thousands) Incurred losses, net of reinsurance $9,377,232Add: All outstanding liabilities before 2007, net of reinsurance 27,327Less: Cumulative paid claims, net of reinsurance 8,670,721Liabilities for claims, net of reinsurance $733,838
[2] Represents reserves as of December 31, 2016 related to IBNR liabilities and expected development on claims paid related to the Freddie Mac Agreement. As described above, we paid an initial claim amount related to that agreement in 2013.
[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 subsequently 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.