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Historical Loss and LAE Development - Incurred Losses and Loss Adjustment Expenses, Net of Reinsurance (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Claims Development                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,938,045 $ 1,688,676                
Casualty Segment | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 1,164,041                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 663,252                  
All outstanding liabilities before 2015, net of reinsurance 10,970                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 511,759 482,569                
Casualty Segment | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 978,702                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 344,593                  
All outstanding liabilities before 2015, net of reinsurance 22,873                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 656,982 556,978                
Casualty Segment | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 475,357                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 279,785                  
All outstanding liabilities before 2015, net of reinsurance 4,407                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 199,979 207,564                
Casualty Segment | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 522,703                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 339,174                  
All outstanding liabilities before 2015, net of reinsurance 1,494                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 185,023 148,226                
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2015 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 75,821 75,958 $ 77,110 $ 75,438 $ 75,470 $ 76,398 $ 78,675 $ 83,579 $ 84,975 $ 94,835
Total IBNR $ 2,433                  
Cumulative number of reported claims | claim 4,425                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 72,138 69,635 68,650 62,997 58,866 54,270 45,056 33,020 19,902 10,157
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2015 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 41,268 40,580 41,471 41,690 42,446 43,328 42,840 47,392 50,857 53,672
Total IBNR $ 1,684                  
Cumulative number of reported claims | claim 709                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 39,194 36,559 35,958 32,752 31,352 28,756 23,184 19,571 10,127 2,048
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2015 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 37,674 37,332 37,578 38,609 39,619 39,653 39,906 42,206 47,831 55,006
Total IBNR $ 617                  
Cumulative number of reported claims | claim 1,338                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 35,779 35,408 34,671 33,529 32,241 28,795 20,920 16,774 10,738 2,215
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2015 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 47,998 47,466 46,685 45,807 45,525 45,162 46,395 47,021 46,258 38,561
Total IBNR $ 429                  
Cumulative number of reported claims | claim 3,188                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 47,452 46,159 45,002 42,626 41,345 39,339 37,222 29,554 20,709 6,984
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2016 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 77,669 78,358 77,729 79,440 83,374 85,449 90,611 96,753 101,950  
Total IBNR $ 4,246                  
Cumulative number of reported claims | claim 4,356                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 71,519 69,968 65,517 60,349 56,152 48,042 35,764 24,186 10,142  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2016 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 27,015 27,733 29,940 29,671 30,251 33,125 37,676 49,385 56,341  
Total IBNR $ 1,939                  
Cumulative number of reported claims | claim 659                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 21,176 20,603 17,807 14,400 12,703 10,054 7,441 3,396 1,068  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2016 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,639 61,881 61,876 65,078 64,730 67,728 69,493 67,760 59,992  
Total IBNR $ 1,407                  
Cumulative number of reported claims | claim 1,507                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 57,976 56,342 53,737 52,846 47,999 39,370 27,465 14,558 2,060  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2016 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 56,736 56,515 55,718 53,915 52,818 52,277 54,105 53,519 50,430  
Total IBNR $ 724                  
Cumulative number of reported claims | claim 3,945                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 55,250 54,245 52,555 47,488 43,564 38,001 30,354 18,354 8,923  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2017 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 91,238 90,744 90,344 90,759 95,513 102,583 111,391 119,741    
Total IBNR $ 5,299                  
Cumulative number of reported claims | claim 4,572                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 79,374 76,283 71,419 62,236 52,823 38,783 25,933 13,154    
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2017 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 37,828 39,600 41,620 43,249 44,737 48,363 55,868 62,863    
Total IBNR $ 4,173                  
Cumulative number of reported claims | claim 661                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 27,840 25,328 22,835 18,470 15,441 9,275 5,679 17    
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2017 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,057 60,340 61,546 59,907 57,450 62,714 62,450 60,572    
Total IBNR $ 2,321                  
Cumulative number of reported claims | claim 1,648                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 55,321 50,623 47,087 42,918 36,522 22,728 11,350 2,455    
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2017 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 47,228 47,619 46,742 45,351 43,764 45,017 53,641 55,640    
Total IBNR $ 786                  
Cumulative number of reported claims | claim 3,640                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 45,061 43,891 41,064 36,141 30,260 24,090 17,070 7,979    
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2018 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 118,084 115,793 114,414 115,076 125,731 130,281 141,513      
Total IBNR $ 10,810                  
Cumulative number of reported claims | claim 4,923                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 101,748 93,504 78,103 63,980 48,424 32,365 15,066      
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2018 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 45,580 47,949 49,861 51,023 54,626 62,646 69,362      
Total IBNR $ 12,439                  
Cumulative number of reported claims | claim 635                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 28,272 23,958 22,016 17,294 10,801 5,823 2,506      
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2018 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 45,331 43,912 47,692 48,457 56,468 62,416 66,128      
Total IBNR $ 3,971                  
Cumulative number of reported claims | claim 1,400                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 38,188 31,002 27,351 24,918 18,840 11,965 1,964      
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2018 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 36,212 35,776 35,442 36,468 38,719 54,592 57,597      
Total IBNR $ 887                  
Cumulative number of reported claims | claim 3,405                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 33,296 30,916 28,844 24,503 19,216 12,827 6,980      
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2019 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 112,638 111,156 109,051 120,570 135,209 146,011        
Total IBNR $ 16,585                  
Cumulative number of reported claims | claim 5,369                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 87,092 74,380 57,750 41,911 30,673 15,698        
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2019 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 70,850 77,185 80,147 79,083 89,691 88,078        
Total IBNR $ 21,981                  
Cumulative number of reported claims | claim 711                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 41,794 38,291 33,375 25,389 19,044 4,213        
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2019 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 42,236 43,969 46,500 52,224 61,712 62,918        
Total IBNR $ 7,144                  
Cumulative number of reported claims | claim 1,516                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 32,622 27,133 19,930 14,117 8,123 1,839        
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2019 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 47,296 44,236 41,925 43,976 56,129 58,297        
Total IBNR $ 2,035                  
Cumulative number of reported claims | claim 3,319                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 42,409 35,546 26,422 21,120 15,852 7,148        
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2020 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 114,336 117,962 122,785 137,439 145,171          
Total IBNR $ 27,988                  
Cumulative number of reported claims | claim 4,749                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 76,345 60,764 45,267 30,596 17,096          
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2020 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 75,351 81,284 90,274 98,409 107,579          
Total IBNR $ 38,495                  
Cumulative number of reported claims | claim 667                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 31,299 24,657 20,988 13,856 2,901          
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2020 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 41,658 40,878 46,853 56,785 60,278          
Total IBNR $ 11,640                  
Cumulative number of reported claims | claim 1,297                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 26,511 16,537 10,412 5,687 1,488          
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2020 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 29,532 28,856 27,665 35,524 43,573          
Total IBNR $ 3,209                  
Cumulative number of reported claims | claim 1,648                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 23,077 20,749 12,035 7,876 3,986          
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2021 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 123,363 125,672 128,483 142,797            
Total IBNR $ 39,997                  
Cumulative number of reported claims | claim 4,683                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 65,454 43,951 29,633 14,428            
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2021 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 120,830 125,028 136,354 136,433            
Total IBNR $ 51,922                  
Cumulative number of reported claims | claim 904                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 59,901 38,977 23,841 5,317            
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2021 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 35,485 38,946 45,854 51,219            
Total IBNR $ 13,192                  
Cumulative number of reported claims | claim 1,229                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 11,856 8,661 5,615 999            
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2021 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 54,599 47,913 51,581 51,322            
Total IBNR $ 6,396                  
Cumulative number of reported claims | claim 2,324                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 37,702 25,886 15,345 5,341            
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2022 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 143,518 144,861 155,203              
Total IBNR $ 65,353                  
Cumulative number of reported claims | claim 4,751                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 56,998 38,712 17,714              
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2022 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 157,626 156,822 153,895              
Total IBNR $ 77,373                  
Cumulative number of reported claims | claim 1,057                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 57,202 28,764 7,479              
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2022 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 46,276 55,316 58,289              
Total IBNR $ 21,839                  
Cumulative number of reported claims | claim 1,156                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 14,672 8,836 2,088              
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2022 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 55,851 53,680 60,862              
Total IBNR $ 11,881                  
Cumulative number of reported claims | claim 2,725                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 27,146 18,296 6,442              
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2023 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 147,366 152,443                
Total IBNR $ 89,241                  
Cumulative number of reported claims | claim 4,483                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 35,634 17,707                
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2023 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 176,607 178,887                
Total IBNR $ 98,709                  
Cumulative number of reported claims | claim 1,067                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 31,867 7,091                
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2023 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 47,848 54,679                
Total IBNR $ 29,547                  
Cumulative number of reported claims | claim 1,195                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,336 1,421                
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2023 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,930 66,863                
Total IBNR $ 14,259                  
Cumulative number of reported claims | claim 2,634                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 18,350 7,407                
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2024 | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 160,008                  
Total IBNR $ 123,161                  
Cumulative number of reported claims | claim 3,561                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 16,950                  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2024 | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 225,747                  
Total IBNR $ 136,830                  
Cumulative number of reported claims | claim 582                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 6,048                  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2024 | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 58,153                  
Total IBNR $ 38,622                  
Cumulative number of reported claims | claim 1,149                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,524                  
Casualty Segment | Short-duration Insurance Contracts, Accident Year 2024 | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 86,321                  
Total IBNR $ 23,003                  
Cumulative number of reported claims | claim 2,678                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 9,431                  
Property segment                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 1,050,835                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 823,459                  
All outstanding liabilities before 2015, net of reinsurance 854                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 228,230 142,876                
Property segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 54,122 54,065 53,359 52,878 52,781 53,111 52,720 53,958 56,103 59,863
Total IBNR $ 6                  
Cumulative number of reported claims | claim 4,077                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 54,116 53,369 53,208 52,400 52,342 52,078 51,290 50,197 49,348 32,184
Property segment | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 55,316 55,385 55,536 55,383 55,424 55,930 55,384 55,594 62,900  
Total IBNR $ 14                  
Cumulative number of reported claims | claim 3,379                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 55,263 55,247 55,215 54,747 54,328 53,006 51,371 46,921 33,134  
Property segment | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 81,194 81,677 81,912 82,319 82,671 84,961 83,273 90,803    
Total IBNR $ 39                  
Cumulative number of reported claims | claim 2,893                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 81,132 80,965 80,958 80,581 78,360 74,415 66,818 41,314    
Property segment | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 78,482 79,234 79,093 80,470 79,961 83,457 89,091      
Total IBNR $ 184                  
Cumulative number of reported claims | claim 2,339                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 78,198 77,696 76,378 75,253 72,357 68,264 37,048      
Property segment | Short-duration Insurance Contracts, Accident Year 2019                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,549 61,185 59,901 61,116 65,189 71,232        
Total IBNR $ 293                  
Cumulative number of reported claims | claim 2,458                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 59,808 59,015 57,038 55,092 51,740 30,703        
Property segment | Short-duration Insurance Contracts, Accident Year 2020                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 110,562 108,363 108,546 110,466 118,247          
Total IBNR $ 7,466                  
Cumulative number of reported claims | claim 2,865                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 99,809 96,350 88,401 79,660 43,192          
Property segment | Short-duration Insurance Contracts, Accident Year 2021                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 114,178 115,587 116,424 135,447            
Total IBNR $ 4,587                  
Cumulative number of reported claims | claim 3,116                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 103,826 99,671 89,174 57,272            
Property segment | Short-duration Insurance Contracts, Accident Year 2022                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 115,228 119,877 138,756              
Total IBNR $ 11,876                  
Cumulative number of reported claims | claim 2,972                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 95,542 84,235 44,667              
Property segment | Short-duration Insurance Contracts, Accident Year 2023                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 159,846 184,252                
Total IBNR $ 20,501                  
Cumulative number of reported claims | claim 3,250                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 130,919 111,137                
Property segment | Short-duration Insurance Contracts, Accident Year 2024                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 221,358                  
Total IBNR $ 90,728                  
Cumulative number of reported claims | claim 2,750                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 64,846                  
Surety Segment                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 100,387                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 50,365                  
All outstanding liabilities before 2015, net of reinsurance (83)                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 49,939 46,813                
Surety Segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 8,275 8,586 8,580 9,275 9,521 9,792 10,456 11,113 12,957 16,958
Total IBNR $ 9                  
Cumulative number of reported claims | claim 1,260                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 8,299 8,575 8,462 9,168 9,186 9,183 9,436 7,695 6,719 $ 3,192
Surety Segment | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 8,206 7,963 8,134 7,948 8,391 8,895 9,351 11,062 18,928  
Total IBNR $ 17                  
Cumulative number of reported claims | claim 1,401                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,918 7,795 7,946 7,673 8,086 7,640 6,299 5,817 $ 3,087  
Surety Segment | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 7,696 7,644 7,769 8,034 8,116 8,798 8,641 16,127    
Total IBNR $ 40                  
Cumulative number of reported claims | claim 1,931                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,500 7,342 7,372 7,362 7,221 7,062 2,862 $ 979    
Surety Segment | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 3,894 3,760 3,996 3,947 4,564 7,227 16,765      
Total IBNR $ 53                  
Cumulative number of reported claims | claim 1,362                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 3,220 2,079 3,020 2,536 2,368 2,588 $ 1,835      
Surety Segment | Short-duration Insurance Contracts, Accident Year 2019                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 2,866 3,453 4,062 5,053 7,205 14,785        
Total IBNR $ 156                  
Cumulative number of reported claims | claim 1,213                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 3,236 3,093 3,039 2,765 2,433 $ 336        
Surety Segment | Short-duration Insurance Contracts, Accident Year 2020                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 9,935 11,516 12,378 14,840 19,241          
Total IBNR $ 1,255                  
Cumulative number of reported claims | claim 987                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,896 3,907 3,828 2,719 $ 835          
Surety Segment | Short-duration Insurance Contracts, Accident Year 2021                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 16,521 12,127 11,724 18,540            
Total IBNR $ 9,208                  
Cumulative number of reported claims | claim 962                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 4,264 3,075 3,229 $ 1,197            
Surety Segment | Short-duration Insurance Contracts, Accident Year 2022                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 10,686 11,490 20,185              
Total IBNR $ 2,565                  
Cumulative number of reported claims | claim 1,080                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,737 4,161 $ (241)              
Surety Segment | Short-duration Insurance Contracts, Accident Year 2023                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 9,024 21,242                
Total IBNR $ 6,886                  
Cumulative number of reported claims | claim 869                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,883 $ 841                
Surety Segment | Short-duration Insurance Contracts, Accident Year 2024                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,284                  
Total IBNR $ 22,503                  
Cumulative number of reported claims | claim 572                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 412