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HISTORICAL LOSS AND LAE DEVELOPMENT - Incurred Losses and Loss Adjustment Expenses, Net of Reinsurance (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
claim
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Claims Development                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,189,835 $ 1,096,349                
Casualty segment | Primary Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 888,240                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 495,044                  
All outstanding liabilities before 2009, net of reinsurance 10,714                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 403,910 372,450                
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 79,656 80,216 $ 78,991 $ 78,685 $ 80,289 $ 85,034 $ 88,820 $ 93,589 $ 96,582 $ 87,875
Total IBNR $ 1,922                  
Cumulative number of reported claims | claim 6,128                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 75,007 73,318 69,514 66,399 61,929 55,992 44,051 29,312 13,025 2,587
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 81,579 82,248 82,193 83,181 86,342 89,622 94,145 98,428 91,139  
Total IBNR $ 2,546                  
Cumulative number of reported claims | claim 5,862                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 76,318 74,814 71,413 67,358 60,769 48,822 32,978 17,124 5,924  
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,465 60,328 59,488 59,028 61,072 65,893 78,406 91,807    
Total IBNR $ 2,922                  
Cumulative number of reported claims | claim 5,179                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 54,391 51,611 47,970 43,276 33,822 23,889 14,539 5,897    
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 59,116 59,556 60,162 60,329 62,882 67,297 80,823      
Total IBNR $ 4,917                  
Cumulative number of reported claims | claim 4,307                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 47,783 45,753 40,609 34,786 22,366 13,021 6,334      
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 66,702 66,389 67,237 71,592 79,497 88,092        
Total IBNR $ 8,251                  
Cumulative number of reported claims | claim 4,266                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 52,387 47,343 40,270 29,545 18,771 11,436        
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 76,398 78,675 83,579 84,975 94,835          
Total IBNR $ 14,891                  
Cumulative number of reported claims | claim 4,362                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 54,270 45,056 33,020 19,902 10,157          
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 85,449 90,611 96,753 101,950            
Total IBNR $ 24,712                  
Cumulative number of reported claims | claim 4,240                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 48,042 35,764 24,186 10,142            
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 102,583 111,391 119,741              
Total IBNR $ 46,557                  
Cumulative number of reported claims | claim 4,336                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 38,783 25,933 13,154              
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 130,281 141,513                
Total IBNR $ 79,489                  
Cumulative number of reported claims | claim 4,490                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 32,365 15,066                
Casualty segment | Primary Occurrence | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 146,011                  
Total IBNR $ 119,051                  
Cumulative number of reported claims | claim 4,193                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 15,698                  
Casualty segment | Excess Occurrence                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 402,184                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 162,440                  
All outstanding liabilities before 2009, net of reinsurance 16,409                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 256,153 209,683                
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 20,579 20,527 20,530 21,018 22,044 20,044 18,932 22,111 24,244 29,314
Total IBNR $ 315                  
Cumulative number of reported claims | claim 503                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 19,390 19,308 19,256 19,175 17,302 15,512 13,282 10,705 6,002 7
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 21,825 22,032 21,295 20,959 19,160 18,641 17,443 17,148 26,272  
Total IBNR $ 625                  
Cumulative number of reported claims | claim 581                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 21,036 20,214 17,769 16,494 10,772 8,793 6,981 5,145 2,169  
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 25,286 23,020 22,433 21,231 21,885 21,021 21,558 29,042    
Total IBNR $ 1,016                  
Cumulative number of reported claims | claim 858                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 21,993 19,310 17,747 16,879 15,380 8,843 3,573 1,315    
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 25,496 24,922 25,599 25,425 26,857 34,824 39,984      
Total IBNR $ 2,220                  
Cumulative number of reported claims | claim 939                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 18,524 17,956 16,967 14,545 10,967 5,701 1,060      
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 33,458 33,372 32,274 35,119 39,095 50,889        
Total IBNR $ 6,322                  
Cumulative number of reported claims | claim 887                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 23,376 22,541 18,852 11,002 4,006 1,899        
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 43,328 42,840 47,392 50,857 53,672          
Total IBNR $ 10,833                  
Cumulative number of reported claims | claim 685                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 28,756 23,184 19,571 10,127 2,048          
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 33,125 37,676 49,385 56,341            
Total IBNR $ 18,457                  
Cumulative number of reported claims | claim 624                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 10,054 7,441 3,396 1,068            
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 48,363 55,868 62,863              
Total IBNR $ 31,333                  
Cumulative number of reported claims | claim 563                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 9,275 5,679 17              
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,646 69,362                
Total IBNR $ 51,501                  
Cumulative number of reported claims | claim 452                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,823 2,506                
Casualty segment | Excess Occurrence | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 88,078                  
Total IBNR $ 66,592                  
Cumulative number of reported claims | claim 293                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 4,213                  
Casualty segment | Claims Made                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 431,118                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 215,563                  
All outstanding liabilities before 2009, net of reinsurance 2,399                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 217,954 204,501                
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 8,680 8,735 9,024 9,175 10,581 11,689 10,429 9,776 15,556 13,690
Total IBNR $ 160                  
Cumulative number of reported claims | claim 502                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 8,515 8,512 8,485 6,956 5,749 5,733 3,626 2,308 1,548 259
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 14,031 11,506 7,852 7,720 8,510 10,619 12,260 17,454 17,416  
Total IBNR $ 592                  
Cumulative number of reported claims | claim 682                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,239 7,132 6,835 6,209 5,637 5,947 4,508 1,949 330  
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 20,785 17,569 17,612 18,022 19,590 20,727 26,144 27,576    
Total IBNR $ 1,781                  
Cumulative number of reported claims | claim 803                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 16,450 15,621 14,378 10,968 9,218 6,898 4,086 433    
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 38,352 37,959 38,473 40,288 44,054 41,488 40,095      
Total IBNR $ 2,255                  
Cumulative number of reported claims | claim 1,042                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 34,535 32,789 29,678 26,121 18,425 7,073 792      
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 53,841 51,554 55,350 58,152 55,386 53,929        
Total IBNR $ 4,391                  
Cumulative number of reported claims | claim 1,305                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 44,127 40,080 35,755 27,923 9,775 1,705        
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 39,653 39,906 42,206 47,831 55,006          
Total IBNR $ 6,376                  
Cumulative number of reported claims | claim 1,336                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 28,795 20,920 16,774 10,738 2,215          
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 67,728 69,493 67,760 59,992            
Total IBNR $ 16,541                  
Cumulative number of reported claims | claim 1,506                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 39,370 27,465 14,558 2,060            
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,714 62,450 60,572              
Total IBNR $ 24,377                  
Cumulative number of reported claims | claim 1,633                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 22,728 11,350 2,455              
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,416 66,128                
Total IBNR $ 37,809                  
Cumulative number of reported claims | claim 1,381                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 11,965 1,964                
Casualty segment | Claims Made | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,918                  
Total IBNR $ 50,178                  
Cumulative number of reported claims | claim 1,411                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,839                  
Casualty segment | Transportation                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 408,580                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 268,881                  
All outstanding liabilities before 2009, net of reinsurance 252                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 139,951 133,558                
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,860 23,776 23,786 23,701 23,625 23,981 25,593 24,912 23,390 27,239
Total IBNR $ 23                  
Cumulative number of reported claims | claim 2,843                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 23,635 23,556 23,533 23,488 23,063 21,792 20,045 15,475 10,116 6,296
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 25,827 25,614 25,167 25,376 25,431 25,272 25,747 23,479 22,957  
Total IBNR $ 41                  
Cumulative number of reported claims | claim 2,469                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 25,052 24,377 23,941 23,537 22,375 19,443 14,477 9,485 5,295  
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,731 23,305 23,620 23,689 23,511 22,924 22,203 21,452    
Total IBNR $ 47                  
Cumulative number of reported claims | claim 2,285                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 23,180 22,730 22,566 20,931 17,318 12,394 8,533 4,466    
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 39,309 39,974 38,811 37,673 32,989 32,853 32,742      
Total IBNR $ 140                  
Cumulative number of reported claims | claim 2,853                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 37,327 35,923 33,480 28,220 19,761 11,978 5,306      
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 40,508 40,202 38,590 36,452 33,015 38,361        
Total IBNR $ 458                  
Cumulative number of reported claims | claim 3,099                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 38,282 33,190 27,457 19,676 13,933 7,125        
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 45,162 46,395 47,021 46,258 38,561          
Total IBNR $ 1,574                  
Cumulative number of reported claims | claim 3,183                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 39,339 37,222 29,554 20,709 6,984          
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 52,277 54,105 53,519 50,430            
Total IBNR $ 4,241                  
Cumulative number of reported claims | claim 3,935                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 38,001 30,354 18,354 8,923            
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 45,017 53,641 55,640              
Total IBNR $ 7,476                  
Cumulative number of reported claims | claim 3,625                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 24,090 17,070 7,979              
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 54,592 57,597                
Total IBNR $ 24,385                  
Cumulative number of reported claims | claim 3,376                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 12,827 6,980                
Casualty segment | Transportation | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 58,297                  
Total IBNR $ 17,932                  
Cumulative number of reported claims | claim 3,082                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,148                  
Property segment                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 653,260                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 581,409                  
All outstanding liabilities before 2009, net of reinsurance 114                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 71,965 77,238                
Property segment | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 52,548 52,903 52,952 52,964 52,927 54,153 53,937 55,427 59,145 63,194
Total IBNR $ 10                  
Cumulative number of reported claims | claim 2,850                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 52,538 52,855 52,851 52,719 52,426 52,729 50,055 47,743 43,091 25,274
Property segment | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,799 62,875 62,456 62,570 62,770 63,724 64,976 66,924 70,246  
Total IBNR $ 65                  
Cumulative number of reported claims | claim 3,028                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 62,730 62,729 61,834 61,428 60,272 59,099 55,778 48,756 27,676  
Property segment | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 78,002 78,161 78,125 79,175 77,569 79,181 80,155 85,485    
Total IBNR $ 97                  
Cumulative number of reported claims | claim 2,640                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 77,323 77,159 76,152 75,640 73,705 72,057 66,509 39,074    
Property segment | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 61,776 61,834 61,914 62,114 62,173 62,090 63,864      
Total IBNR $ 183                  
Cumulative number of reported claims | claim 2,995                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 61,325 61,195 60,520 59,259 57,407 50,840 32,208      
Property segment | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 49,444 49,217 48,761 48,801 49,441 56,587        
Total IBNR $ 158                  
Cumulative number of reported claims | claim 4,561                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 49,027 47,799 46,528 46,148 43,380 30,550        
Property segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 53,111 52,720 53,958 56,103 59,863          
Total IBNR $ 403                  
Cumulative number of reported claims | claim 4,075                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 55,930 55,384 55,594 62,900            
Total IBNR $ 1,418                  
Cumulative number of reported claims | claim 3,371                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 84,961 83,273 90,803              
Total IBNR $ 5,861                  
Cumulative number of reported claims | claim 2,883                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 83,457 89,091                
Total IBNR $ 10,867                  
Cumulative number of reported claims | claim 2,321                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 68,264 37,048                
Property segment | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 71,232                  
Total IBNR $ 27,090                  
Cumulative number of reported claims | claim 2,098                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 30,703                  
Surety segment                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 91,143                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 68,151                  
All outstanding liabilities before 2009, net of reinsurance 1,996                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 24,988 28,237                
Surety segment | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 6,743 6,580 6,244 7,645 7,136 6,810 7,076 6,630 8,205 13,961
Total IBNR $ 47                  
Cumulative number of reported claims | claim 1,543                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 6,733 6,637 6,663 7,822 7,285 7,151 7,092 5,702 3,205 $ 1,724
Surety segment | Short-duration Insurance Contracts, Accident Year 2011                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 18,293 18,281 16,480 16,695 16,766 17,321 17,792 17,832 13,842  
Total IBNR $ 35                  
Cumulative number of reported claims | claim 1,679                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 18,251 17,013 17,086 17,086 17,212 17,403 17,151 16,932 $ 8,160  
Surety segment | Short-duration Insurance Contracts, Accident Year 2012                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 7,082 7,099 7,471 7,867 8,180 8,667 11,452 17,114    
Total IBNR $ 38                  
Cumulative number of reported claims | claim 1,474                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 6,996 7,065 7,406 7,536 7,416 6,726 6,680 $ 1,883    
Surety segment | Short-duration Insurance Contracts, Accident Year 2013                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 5,209 5,231 5,271 5,399 6,170 7,516 16,080      
Total IBNR $ 65                  
Cumulative number of reported claims | claim 1,406                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,128 5,150 5,098 4,911 4,701 2,856 $ 1,116      
Surety segment | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 4,319 4,267 4,427 5,225 8,106 16,450        
Total IBNR $ 67                  
Cumulative number of reported claims | claim 1,346                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 4,234 4,131 4,059 4,166 4,283 $ 722        
Surety segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 9,792 10,456 11,113 12,957 16,958          
Total IBNR $ 384                  
Cumulative number of reported claims | claim 1,217                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 8,895 9,351 11,062 18,928            
Total IBNR $ 742                  
Cumulative number of reported claims | claim 1,359                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 8,798 8,641 16,127              
Total IBNR $ 1,469                  
Cumulative number of reported claims | claim 1,645                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 7,227 16,765                
Total IBNR $ 3,965                  
Cumulative number of reported claims | claim 1,157                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 2,588 $ 1,835                
Surety segment | Short-Duration Insurance Contract, Accident Year 2019 [Member]                    
Claims Development                    
Incurred losses and loss adjustment expenses, net of reinsurance 14,785                  
Total IBNR $ 14,035                  
Cumulative number of reported claims | claim 607                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 336