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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 13,445,271                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3,179,551                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,155,014                  
All outstanding liabilities before 2013, net of reinsurance 299,288                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,323,825                  
Reinsurance | Casualty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 133,094 $ 133,687 $ 133,401 $ 129,120 $ 132,701 $ 134,204 $ 146,230 $ 152,392 $ 156,619 $ 163,425
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,485 81,167 76,141 70,289 62,751 54,323 42,861 22,886 9,822 2,421
Total of IBNR liabilities plus expected development on reported claims 26,542                  
Reinsurance | Casualty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 231,175 230,944 234,293 233,922 224,105 227,485 214,724 217,991 212,923  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 152,586 143,929 133,263 113,596 90,530 63,214 40,651 15,973 3,885  
Total of IBNR liabilities plus expected development on reported claims 33,255                  
Reinsurance | Casualty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 247,419 245,756 242,554 235,637 231,473 224,385 216,759 217,343    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 151,119 136,138 119,096 95,988 70,523 46,933 20,208 4,440    
Total of IBNR liabilities plus expected development on reported claims 44,753                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 268,079 264,475 264,573 257,214 242,089 221,004 208,192      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 155,584 131,341 112,818 86,362 51,494 25,626 5,720      
Total of IBNR liabilities plus expected development on reported claims 46,122                  
Reinsurance | Casualty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 310,858 304,194 293,381 267,173 251,827 262,894        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 163,243 136,489 112,474 63,922 30,316 6,417        
Total of IBNR liabilities plus expected development on reported claims 52,415                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 293,320 281,852 276,802 284,405 270,621          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 154,173 128,728 106,443 31,240 7,576          
Total of IBNR liabilities plus expected development on reported claims 56,325                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 372,669 361,549 334,755 325,359            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 129,766 96,593 57,568 15,798            
Total of IBNR liabilities plus expected development on reported claims 93,310                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 349,831 367,595 378,668              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 90,156 50,383 17,646              
Total of IBNR liabilities plus expected development on reported claims 169,909                  
Reinsurance | Casualty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 431,165 434,187                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 53,264 14,633                
Total of IBNR liabilities plus expected development on reported claims 292,696                  
Reinsurance | Casualty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 541,941                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17,638                  
Total of IBNR liabilities plus expected development on reported claims 482,552                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,017,376                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 484,830                  
All outstanding liabilities before 2013, net of reinsurance 2,612                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 535,158                  
Reinsurance | Property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 26,221 26,344 26,543 26,415 27,248 27,974 30,518 34,959 45,962 65,372
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 27,023 26,998 27,233 26,549 26,549 26,329 24,697 23,001 18,496 12,035
Total of IBNR liabilities plus expected development on reported claims (138)                  
Reinsurance | Property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 19,045 19,004 19,229 19,326 20,026 21,764 24,500 29,801 43,800  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18,592 18,629 18,550 18,421 18,244 18,679 17,902 19,544 13,619  
Total of IBNR liabilities plus expected development on reported claims (10)                  
Reinsurance | Property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,569 2,932 3,133 3,779 5,531 11,425 17,558 32,748    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,874 1,817 1,745 1,659 2,103 1,843 (2,109) (3,141)    
Total of IBNR liabilities plus expected development on reported claims 68                  
Reinsurance | Property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 5,181 5,987 6,886 9,190 12,749 16,582 23,224      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,594 2,433 2,086 2,932 1,870 1,759 (7,039)      
Total of IBNR liabilities plus expected development on reported claims 877                  
Reinsurance | Property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 21,026 24,239 35,893 49,507 53,699 86,410        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16,034 14,215 27,060 37,084 31,621 30,625        
Total of IBNR liabilities plus expected development on reported claims (803)                  
Reinsurance | Property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 10,722 19,831 33,425 52,001 73,041          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (8,100) (10,934) 18,253 7,344 27,424          
Total of IBNR liabilities plus expected development on reported claims 3,039                  
Reinsurance | Property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4,590 13,093 14,252 25,526            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (11,472) 12,895 8,845 4,374            
Total of IBNR liabilities plus expected development on reported claims 4,576                  
Reinsurance | Property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 326,262 322,680 260,244              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 200,510 152,075 52,592              
Total of IBNR liabilities plus expected development on reported claims 33,413                  
Reinsurance | Property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 302,124 308,014                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 167,806 64,408                
Total of IBNR liabilities plus expected development on reported claims 29,963                  
Reinsurance | Property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 299,636                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 69,969                  
Total of IBNR liabilities plus expected development on reported claims 73,474                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,592,090                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,587,251                  
All outstanding liabilities before 2013, net of reinsurance 5,765                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,010,604                  
Reinsurance | Property excluding property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 63,390 62,288 62,774 62,070 63,247 64,013 65,734 69,981 76,290 114,775
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 63,228 61,665 61,640 60,777 55,272 53,400 52,614 49,433 42,418 25,943
Total of IBNR liabilities plus expected development on reported claims 29                  
Reinsurance | Property excluding property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 79,307 80,348 81,812 83,476 87,768 90,031 98,263 116,331 142,092  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 77,894 77,728 78,029 78,067 77,687 76,060 71,144 62,414 23,342  
Total of IBNR liabilities plus expected development on reported claims 443                  
Reinsurance | Property excluding property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 166,580 172,189 175,812 186,861 187,569 183,709 187,932 213,681    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 159,054 158,537 158,293 164,637 159,482 148,887 118,396 75,458    
Total of IBNR liabilities plus expected development on reported claims 3,909                  
Reinsurance | Property excluding property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 128,941 135,116 138,216 134,362 136,367 144,323 174,506      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 114,432 113,300 111,039 103,202 97,918 94,121 33,236      
Total of IBNR liabilities plus expected development on reported claims 6,208                  
Reinsurance | Property excluding property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 204,128 212,133 227,891 235,310 247,462 266,628        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 181,029 177,737 162,933 155,139 124,220 27,456        
Total of IBNR liabilities plus expected development on reported claims 8,794                  
Reinsurance | Property excluding property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 201,429 211,852 234,794 238,876 222,932          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 174,778 166,598 151,632 107,172 29,654          
Total of IBNR liabilities plus expected development on reported claims 7,370                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 189,456 194,164 204,620 214,513            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 161,573 149,377 123,293 42,919            
Total of IBNR liabilities plus expected development on reported claims 8,407                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 319,097 338,712 366,726              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 242,844 207,061 100,927              
Total of IBNR liabilities plus expected development on reported claims 36,912                  
Reinsurance | Property excluding property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 497,059 545,101                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 269,481 135,815                
Total of IBNR liabilities plus expected development on reported claims 83,934                  
Reinsurance | Property excluding property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 742,703                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 142,938                  
Total of IBNR liabilities plus expected development on reported claims 360,528                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 480,791                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 208,846                  
All outstanding liabilities before 2013, net of reinsurance 17,999                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 289,944                  
Reinsurance | Marine and aviation | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25,695 26,728 29,434 33,001 33,453 34,207 34,293 35,669 36,765 38,167
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 23,648 22,912 22,941 23,176 22,803 21,557 20,580 17,678 13,054 4,751
Total of IBNR liabilities plus expected development on reported claims 1,012                  
Reinsurance | Marine and aviation | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18,511 21,651 21,698 22,919 23,302 25,297 26,995 28,757 30,566  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17,084 15,729 15,650 14,794 14,368 12,209 11,335 7,795 4,005  
Total of IBNR liabilities plus expected development on reported claims 800                  
Reinsurance | Marine and aviation | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25,008 27,299 28,120 30,423 31,373 31,499 37,019 33,134    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22,297 22,114 21,971 22,318 20,623 18,852 13,321 (6)    
Total of IBNR liabilities plus expected development on reported claims 1,514                  
Reinsurance | Marine and aviation | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 11,952 14,896 16,834 19,122 23,448 22,625 27,258      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 7,028 6,656 5,764 3,169 445 (1,739) (7,371)      
Total of IBNR liabilities plus expected development on reported claims 4,080                  
Reinsurance | Marine and aviation | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 17,329 19,842 20,749 23,613 26,165 28,590        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11,817 11,488 10,897 9,249 6,433 1,650        
Total of IBNR liabilities plus expected development on reported claims 4,178                  
Reinsurance | Marine and aviation | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 21,052 24,192 24,058 25,680 27,613          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 13,923 13,332 11,021 6,817 1,993          
Total of IBNR liabilities plus expected development on reported claims 3,738                  
Reinsurance | Marine and aviation | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 60,635 60,321 54,684 48,383            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 34,637 28,680 21,261 10,537            
Total of IBNR liabilities plus expected development on reported claims 5,574                  
Reinsurance | Marine and aviation | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 79,338 75,695 82,716              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 42,203 26,129 9,096              
Total of IBNR liabilities plus expected development on reported claims 28,621                  
Reinsurance | Marine and aviation | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 95,586 110,129                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 24,108 8,407                
Total of IBNR liabilities plus expected development on reported claims 51,391                  
Reinsurance | Marine and aviation | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 125,685                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12,101                  
Total of IBNR liabilities plus expected development on reported claims 99,917                  
Reinsurance | Other specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4,248,999                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,817,079                  
All outstanding liabilities before 2013, net of reinsurance 13,001                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,444,921                  
Reinsurance | Other specialty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 254,380 255,453 257,960 263,713 264,418 266,970 267,106 269,105 280,398 304,905
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 243,881 240,669 237,559 237,023 229,228 222,292 209,775 188,651 155,936 $ 81,609
Total of IBNR liabilities plus expected development on reported claims 4,327                  
Reinsurance | Other specialty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 287,941 289,460 295,270 299,789 298,357 303,589 310,153 308,074 328,056  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 271,712 270,529 266,898 263,123 250,427 240,680 223,243 181,222 $ 92,743  
Total of IBNR liabilities plus expected development on reported claims 6,034                  
Reinsurance | Other specialty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 248,848 250,103 261,158 263,985 263,826 267,079 269,237 271,235    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 231,384 230,640 227,879 216,683 204,444 190,699 157,176 $ 80,453    
Total of IBNR liabilities plus expected development on reported claims 6,340                  
Reinsurance | Other specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 293,571 296,251 301,277 295,116 303,432 310,907 313,982      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 277,028 271,609 265,763 249,699 231,761 196,496 $ 103,649      
Total of IBNR liabilities plus expected development on reported claims 8,371                  
Reinsurance | Other specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 351,478 355,763 357,212 357,762 375,347 382,884        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 322,863 312,273 299,405 285,299 245,165 $ 130,150        
Total of IBNR liabilities plus expected development on reported claims 22,234                  
Reinsurance | Other specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 408,905 413,116 390,135 395,484 402,372          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 340,061 323,868 303,141 265,000 $ 124,996          
Total of IBNR liabilities plus expected development on reported claims 32,668                  
Reinsurance | Other specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 383,491 387,810 393,864 414,049            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 293,260 267,972 204,625 $ 116,762            
Total of IBNR liabilities plus expected development on reported claims 38,889                  
Reinsurance | Other specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 506,164 511,136 579,367              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 361,031 285,729 $ 129,621              
Total of IBNR liabilities plus expected development on reported claims 57,946                  
Reinsurance | Other specialty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 590,091 589,452                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 300,025 $ 146,503                
Total of IBNR liabilities plus expected development on reported claims 148,264                  
Reinsurance | Other specialty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 924,130                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 175,834                  
Total of IBNR liabilities plus expected development on reported claims $ 601,334