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HISTORICAL LOSS AND LAE DEVELOPMENT - Incurred Losses and Loss Adjustment Expenses, Net of Reinsurance (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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 ($)
Dec. 31, 2009
USD ($)
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 1,096,349 $ 969,512                
Casualty segment | Primary Occurrence                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 852,372                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 491,833                  
All outstanding liabilities before 2009, net of reinsurance 11,911                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 372,450 325,182                
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 81,445 80,350 $ 80,518 $ 81,138 $ 82,651 $ 86,888 $ 91,441 $ 99,765 $ 119,957 $ 85,476
Total IBNR $ 2,202                  
Cumulative number of reported claims | claim 5,713                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 77,175 75,948 74,920 70,220 65,913 58,460 43,702 24,115 9,233 1,972
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 80,216 78,991 78,685 80,289 85,034 88,820 93,589 96,582 87,875  
Total IBNR $ 2,392                  
Cumulative number of reported claims | claim 6,117                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 82,248 82,193 83,181 86,342 89,622 94,145 98,428 91,139    
Total IBNR $ 3,180                  
Cumulative number of reported claims | claim 5,851                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 60,328 59,488 59,028 61,072 65,893 78,406 91,807      
Total IBNR $ 3,502                  
Cumulative number of reported claims | claim 5,163                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 59,556 60,162 60,329 62,882 67,297 80,823        
Total IBNR $ 6,538                  
Cumulative number of reported claims | claim 4,287                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 66,389 67,237 71,592 79,497 88,092          
Total IBNR $ 12,492                  
Cumulative number of reported claims | claim 4,242                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 47,343 40,270 29,545 18,771 11,436          
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 78,675 83,579 84,975 94,835            
Total IBNR $ 21,351                  
Cumulative number of reported claims | claim 4,311                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 45,056 33,020 19,902 10,157            
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 90,611 96,753 101,950              
Total IBNR $ 38,505                  
Cumulative number of reported claims | claim 4,148                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 35,764 24,186 10,142              
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 111,391 119,741                
Total IBNR $ 64,662                  
Cumulative number of reported claims | claim 4,119                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 25,933 13,154                
Casualty segment | Primary Occurrence | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 141,513                  
Total IBNR $ 109,482                  
Cumulative number of reported claims | claim 3,773                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 15,066                  
Casualty segment | Excess Occurrence                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 341,691                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 149,926                  
All outstanding liabilities before 2009, net of reinsurance 17,918                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 209,683 188,963                
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 12,072 12,055 11,982 12,601 12,459 12,966 12,893 14,981 19,719 30,267
Total IBNR $ 285                  
Cumulative number of reported claims | claim 567                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 11,787 11,786 11,780 11,776 10,808 11,001 9,460 6,585 3,947 956
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 20,527 20,530 21,018 22,044 20,044 18,932 22,111 24,244 29,314  
Total IBNR $ 369                  
Cumulative number of reported claims | claim 500                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 22,032 21,295 20,959 19,160 18,641 17,443 17,148 26,272    
Total IBNR $ 824                  
Cumulative number of reported claims | claim 581                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,020 22,433 21,231 21,885 21,021 21,558 29,042      
Total IBNR $ 1,386                  
Cumulative number of reported claims | claim 855                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 24,922 25,599 25,425 26,857 34,824 39,984        
Total IBNR $ 3,488                  
Cumulative number of reported claims | claim 933                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 33,372 32,274 35,119 39,095 50,889          
Total IBNR $ 8,832                  
Cumulative number of reported claims | claim 875                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 22,541 18,852 11,002 4,006 1,899          
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 42,840 47,392 50,857 53,672            
Total IBNR $ 14,320                  
Cumulative number of reported claims | claim 669                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 23,184 19,571 10,127 2,048            
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 37,676 49,385 56,341              
Total IBNR $ 25,675                  
Cumulative number of reported claims | claim 572                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 7,441 3,396 1,068              
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 55,868 62,863                
Total IBNR $ 43,891                  
Cumulative number of reported claims | claim 473                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,679 17                
Casualty segment | Excess Occurrence | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 69,362                  
Total IBNR $ 63,524                  
Cumulative number of reported claims | claim 258                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 2,506                  
Casualty segment | Claims Made                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 381,356                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 177,788                  
All outstanding liabilities before 2009, net of reinsurance 933                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 204,501 171,241                
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 16,056 11,827 12,053 12,810 13,117 11,710 13,562 9,687 13,703 12,918
Total IBNR $ 398                  
Cumulative number of reported claims | claim 383                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 11,955 11,475 11,398 11,217 10,678 5,176 3,413 773 442 113
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 8,735 9,024 9,175 10,581 11,689 10,429 9,776 15,556 13,690  
Total IBNR $ 219                  
Cumulative number of reported claims | claim 502                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 11,506 7,852 7,720 8,510 10,619 12,260 17,454 17,416    
Total IBNR $ 640                  
Cumulative number of reported claims | claim 682                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 17,569 17,612 18,022 19,590 20,727 26,144 27,576      
Total IBNR $ 1,251                  
Cumulative number of reported claims | claim 803                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 37,959 38,473 40,288 44,054 41,488 40,095        
Total IBNR $ 3,751                  
Cumulative number of reported claims | claim 1,042                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 32,789 29,678 26,121 18,425 7,073 792        
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 51,554 55,350 58,152 55,386 53,929          
Total IBNR $ 7,271                  
Cumulative number of reported claims | claim 1,304                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 40,080 35,755 27,923 9,775 1,705          
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 39,906 42,206 47,831 55,006            
Total IBNR $ 10,559                  
Cumulative number of reported claims | claim 1,335                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 20,920 16,774 10,738 2,215            
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 69,493 67,760 59,992              
Total IBNR $ 23,817                  
Cumulative number of reported claims | claim 1,500                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 27,465 14,558 2,060              
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,450 60,572                
Total IBNR $ 35,365                  
Cumulative number of reported claims | claim 1,627                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 11,350 2,455                
Casualty segment | Claims Made | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 66,128                  
Total IBNR $ 50,820                  
Cumulative number of reported claims | claim 1,272                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,964                  
Casualty segment | Transportation                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 386,520                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 253,052                  
All outstanding liabilities before 2009, net of reinsurance 90                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 133,558 119,704                
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 21,911 21,926 21,969 21,958 22,340 22,613 22,929 23,174 23,366 26,349
Total IBNR $ 19                  
Cumulative number of reported claims | claim 2,644                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 21,650 21,650 21,650 21,640 21,325 21,100 19,933 14,613 8,698 5,035
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,776 23,786 23,701 23,625 23,981 25,593 24,912 23,390 27,239  
Total IBNR $ 44                  
Cumulative number of reported claims | claim 2,843                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 25,614 25,167 25,376 25,431 25,272 25,747 23,479 22,957    
Total IBNR $ 52                  
Cumulative number of reported claims | claim 2,469                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 23,305 23,620 23,689 23,511 22,924 22,203 21,452      
Total IBNR $ 76                  
Cumulative number of reported claims | claim 2,284                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 39,974 38,811 37,673 32,989 32,853 32,742        
Total IBNR $ 350                  
Cumulative number of reported claims | claim 2,852                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 35,923 33,480 28,220 19,761 11,978 5,306        
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 40,202 38,590 36,452 33,015 38,361          
Total IBNR $ 911                  
Cumulative number of reported claims | claim 3,099                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 33,190 27,457 19,676 13,933 7,125          
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 46,395 47,021 46,258 38,561            
Total IBNR $ 3,824                  
Cumulative number of reported claims | claim 3,179                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 37,222 29,554 20,709 6,984            
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 54,105 53,519 50,430              
Total IBNR $ 7,632                  
Cumulative number of reported claims | claim 3,920                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 30,354 18,354 8,923              
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 53,641 55,640                
Total IBNR $ 16,406                  
Cumulative number of reported claims | claim 3,597                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 17,070 7,979                
Casualty segment | Transportation | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 57,597                  
Total IBNR $ 16,690                  
Cumulative number of reported claims | claim 3,154                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 6,980                  
Property segment                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 634,383                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 557,162                  
All outstanding liabilities before 2009, net of reinsurance 17                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 77,238 68,867                
Property segment | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 48,925 49,323 49,267 48,707 48,857 48,969 49,534 52,286 55,821 59,975
Total IBNR $ 13                  
Cumulative number of reported claims | claim 2,630                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 48,898 49,173 49,051 48,329 48,297 48,031 46,004 43,758 40,775 25,464
Property segment | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 52,903 52,952 52,964 52,927 54,153 53,937 55,427 59,145 63,194  
Total IBNR $ 29                  
Cumulative number of reported claims | claim 2,851                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 62,875 62,456 62,570 62,770 63,724 64,976 66,924 70,246    
Total IBNR $ 142                  
Cumulative number of reported claims | claim 3,028                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 78,161 78,125 79,175 77,569 79,181 80,155 85,485      
Total IBNR $ 167                  
Cumulative number of reported claims | claim 2,640                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 61,834 61,914 62,114 62,173 62,090 63,864        
Total IBNR $ 273                  
Cumulative number of reported claims | claim 2,995                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 61,195 60,520 59,259 57,407 50,840 32,208        
Property segment | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 49,217 48,761 48,801 49,441 56,587          
Total IBNR $ 315                  
Cumulative number of reported claims | claim 4,560                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 47,799 46,528 46,148 43,380 30,550          
Property segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 52,720 53,958 56,103 59,863            
Total IBNR $ 680                  
Cumulative number of reported claims | claim 4,076                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 51,290 50,197 49,348 32,184            
Property segment | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 55,384 55,594 62,900              
Total IBNR $ 2,093                  
Cumulative number of reported claims | claim 3,369                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 51,371 46,921 33,134              
Property segment | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 83,273 90,803                
Total IBNR $ 9,346                  
Cumulative number of reported claims | claim 2,873                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 66,818 41,314                
Property segment | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 89,091                  
Total IBNR $ 23,235                  
Cumulative number of reported claims | claim 2,030                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 37,048                  
Surety segment                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 91,606                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 65,361                  
All outstanding liabilities before 2009, net of reinsurance 1,992                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 28,237 23,375                
Surety segment | Short-duration Insurance Contracts, Accident Year 2009                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 4,935 4,860 4,923 4,288 4,551 4,146 4,246 4,708 4,896 15,474
Total IBNR $ 2                  
Cumulative number of reported claims | claim 1,665                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 4,933 4,849 3,908 3,919 4,336 3,490 2,493 2,382 1,914 $ 892
Surety segment | Short-duration Insurance Contracts, Accident Year 2010                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 6,580 6,244 7,645 7,136 6,810 7,076 6,630 8,205 13,961  
Total IBNR $ 14                  
Cumulative number of reported claims | claim 1,540                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 18,281 16,480 16,695 16,766 17,321 17,792 17,832 13,842    
Total IBNR $ 13                  
Cumulative number of reported claims | claim 1,674                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 7,099 7,471 7,867 8,180 8,667 11,452 17,114      
Total IBNR $ 22                  
Cumulative number of reported claims | claim 1,469                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 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 [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 5,231 5,271 5,399 6,170 7,516 16,080        
Total IBNR $ 50                  
Cumulative number of reported claims | claim 1,400                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 5,150 5,098 4,911 4,701 2,856 $ 1,116        
Surety segment | Short-duration Insurance Contracts, Accident Year 2014                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 4,267 4,427 5,225 8,106 16,450          
Total IBNR $ 88                  
Cumulative number of reported claims | claim 1,337                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 4,131 4,059 4,166 4,283 $ 722          
Surety segment | Short-duration Insurance Contracts, Accident Year 2015                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 10,456 11,113 12,957 16,958            
Total IBNR $ 824                  
Cumulative number of reported claims | claim 1,201                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 9,436 7,695 6,719 $ 3,192            
Surety segment | Short-duration Insurance Contracts, Accident Year 2016                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 9,351 11,062 18,928              
Total IBNR $ 1,543                  
Cumulative number of reported claims | claim 1,307                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 6,299 5,817 $ 3,087              
Surety segment | Short-duration Insurance Contracts, Accident Year 2017                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 8,641 16,127                
Total IBNR $ 3,630                  
Cumulative number of reported claims | claim 1,409                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 2,862 $ 979                
Surety segment | Short-duration Insurance Contracts, Accident Year 2018                    
Claims Development [Line Items]                    
Incurred losses and loss adjustment expenses, net of reinsurance 16,765                  
Total IBNR $ 14,535                  
Cumulative number of reported claims | claim 654                  
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 1,835