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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Thousands
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
Dec. 31, 2012
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 11,886,330                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,815,578                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,006,894                  
All outstanding liabilities before 2012, net of reinsurance 297,823                  
Reinsurance | Casualty | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 119,222 $ 120,260 $ 121,721 $ 118,457 $ 109,788 $ 115,131 $ 125,104 $ 137,049 $ 141,202 $ 143,029
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 79,364 75,833 69,877 59,511 47,807 36,562 25,523 14,690 8,486 1,306
Total of IBNR liabilities plus expected development on reported claims 24,441                  
Reinsurance | Casualty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 135,959 135,762 131,475 135,155 136,717 148,784 155,066 159,257 166,016  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 81,856 76,703 70,803 63,136 54,567 43,069 23,044 9,930 2,480  
Total of IBNR liabilities plus expected development on reported claims 30,873                  
Reinsurance | Casualty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 236,378 240,067 239,765 230,019 233,552 219,355 222,109 216,882    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 145,376 134,529 114,456 91,098 63,441 40,804 16,061 3,920    
Total of IBNR liabilities plus expected development on reported claims 41,077                  
Reinsurance | Casualty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 252,809 249,029 242,180 238,126 230,830 221,922 223,208      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 138,035 120,566 96,835 71,098 47,288 20,275 4,463      
Total of IBNR liabilities plus expected development on reported claims 57,345                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 272,689 273,266 266,254 251,415 227,534 215,222        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 132,814 113,835 86,798 51,684 25,649 5,739        
Total of IBNR liabilities plus expected development on reported claims 54,087                  
Reinsurance | Casualty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 313,605 301,616 273,166 257,088 270,728          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 137,921 113,307 64,075 30,360 6,429          
Total of IBNR liabilities plus expected development on reported claims 66,450                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 290,955 285,646 294,820 281,141            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 129,196 106,571 31,218 7,580            
Total of IBNR liabilities plus expected development on reported claims 66,572                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 374,002 348,015 336,062              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 96,935 57,643 15,815              
Total of IBNR liabilities plus expected development on reported claims 120,045                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 374,912 386,684                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 50,603 17,730                
Total of IBNR liabilities plus expected development on reported claims 234,251                  
Reinsurance | Casualty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 445,047                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 14,794                  
Total of IBNR liabilities plus expected development on reported claims 392,885                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 880,759                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 396,960                  
All outstanding liabilities before 2012, net of reinsurance 2,449                  
Reinsurance | Property catastrophe | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 96,447 96,531 97,145 97,037 99,071 99,885 102,114 108,590 122,942 149,957
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 95,606 95,414 95,312 94,625 94,015 92,886 90,727 83,822 70,832 25,850
Total of IBNR liabilities plus expected development on reported claims 105                  
Reinsurance | Property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 27,657 27,865 27,727 28,617 29,345 31,902 36,401 47,780 67,257  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 28,346 28,597 27,892 27,891 27,652 25,894 24,038 19,201 12,200  
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 19,615 19,841 19,945 20,652 22,412 25,296 30,877 45,159    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 19,241 19,154 19,013 18,821 19,231 18,402 19,939 13,622    
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 2,920 3,130 3,775 5,585 11,580 18,075 33,579      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,781 1,705 1,616 2,050 1,786 (2,518) (3,152)      
Total of IBNR liabilities plus expected development on reported claims 67                  
Reinsurance | Property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 7,426 8,362 10,772 14,575 18,719 25,641        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,668 3,312 4,082 2,796 2,521 (6,722)        
Total of IBNR liabilities plus expected development on reported claims 881                  
Reinsurance | Property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25,121 36,846 50,553 54,768 87,504          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 14,969 27,797 37,791 32,228 30,704          
Total of IBNR liabilities plus expected development on reported claims (712)                  
Reinsurance | Property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 27,657 41,642 60,418 77,868            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (4,612) 24,259 12,506 27,497            
Total of IBNR liabilities plus expected development on reported claims 4,783                  
Reinsurance | Property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 23,534 24,808 38,570              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18,134 12,680 3,834              
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 334,185 267,750                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 155,063 53,275                
Total of IBNR liabilities plus expected development on reported claims 40,561                  
Reinsurance | Property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 316,197                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 64,764                  
Total of IBNR liabilities plus expected development on reported claims 61,821                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,081,611                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,365,172                  
All outstanding liabilities before 2012, net of reinsurance 7,595                  
Reinsurance | Property excluding property catastrophe | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 103,367 102,994 108,436 111,001 112,477 114,699 119,124 123,689 121,808 156,162
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 102,525 102,504 102,598 102,658 103,480 102,844 101,868 93,198 78,080 26,153
Total of IBNR liabilities plus expected development on reported claims 508                  
Reinsurance | Property excluding property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 62,782 63,269 62,504 63,702 64,486 66,208 70,558 76,905 115,473  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 62,139 62,113 61,183 55,676 53,796 52,997 49,816 42,737 25,993  
Total of IBNR liabilities plus expected development on reported claims 384                  
Reinsurance | Property excluding property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 80,940 82,408 84,130 88,438 90,710 99,328 117,448 143,464    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 78,268 78,567 78,657 78,274 76,634 71,692 62,800 23,496    
Total of IBNR liabilities plus expected development on reported claims 923                  
Reinsurance | Property excluding property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 173,659 177,281 188,343 189,045 184,774 189,109 215,095      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 159,925 159,675 166,025 160,848 149,814 119,237 75,622      
Total of IBNR liabilities plus expected development on reported claims 8,482                  
Reinsurance | Property excluding property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 137,579 140,681 136,868 138,375 146,307 177,039        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 115,102 112,838 104,984 99,428 95,616 33,400        
Total of IBNR liabilities plus expected development on reported claims 12,700                  
Reinsurance | Property excluding property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 216,358 233,153 240,749 253,859 271,713          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 181,628 166,087 158,066 125,768 27,569          
Total of IBNR liabilities plus expected development on reported claims 13,045                  
Reinsurance | Property excluding property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 214,942 238,052 242,069 225,638            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 169,054 153,944 108,863 30,047            
Total of IBNR liabilities plus expected development on reported claims 11,593                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 196,840 206,997 216,653              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 150,931 124,222 43,230              
Total of IBNR liabilities plus expected development on reported claims 17,777                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 343,078 371,752                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 208,888 101,969                
Total of IBNR liabilities plus expected development on reported claims 51,075                  
Reinsurance | Property excluding property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 552,066                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 136,712                  
Total of IBNR liabilities plus expected development on reported claims 255,343                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 425,590                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 196,564                  
All outstanding liabilities before 2012, net of reinsurance 16,855                  
Reinsurance | Marine and aviation | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 40,016 41,182 43,028 46,046 49,727 51,079 52,286 55,053 58,868 58,992
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 38,116 38,131 38,038 37,746 36,257 35,055 33,313 27,528 11,433 2,658
Total of IBNR liabilities plus expected development on reported claims 1,005                  
Reinsurance | Marine and aviation | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 27,605 30,316 33,970 34,415 35,157 35,251 36,653 37,668 38,881  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 23,753 23,786 24,049 23,672 22,398 21,388 18,415 13,731 4,945  
Total of IBNR liabilities plus expected development on reported claims 2,394                  
Reinsurance | Marine and aviation | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 21,984 22,031 23,310 23,677 25,674 27,373 29,159 30,958    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16,036 15,956 15,080 14,645 12,469 11,590 7,985 4,177    
Total of IBNR liabilities plus expected development on reported claims 4,909                  
Reinsurance | Marine and aviation | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 27,680 28,464 30,789 31,736 31,790 37,505 33,646      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22,445 22,306 22,629 20,861 19,023 13,418 7      
Total of IBNR liabilities plus expected development on reported claims 3,867                  
Reinsurance | Marine and aviation | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 15,019 16,969 19,273 23,567 22,747 27,351        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 6,767 5,864 3,261 521 (1,687) (7,333)        
Total of IBNR liabilities plus expected development on reported claims 6,708                  
Reinsurance | Marine and aviation | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 19,903 20,827 23,830 26,346 28,800          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11,632 11,030 9,367 6,541 1,660          
Total of IBNR liabilities plus expected development on reported claims 6,387                  
Reinsurance | Marine and aviation | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 24,756 24,615 26,084 28,017            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 13,585 11,236 6,968 2,005            
Total of IBNR liabilities plus expected development on reported claims 6,452                  
Reinsurance | Marine and aviation | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 60,983 55,307 48,929              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 29,068 21,580 10,756              
Total of IBNR liabilities plus expected development on reported claims 15,112                  
Reinsurance | Marine and aviation | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 76,598 83,457                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 26,519 9,220                
Total of IBNR liabilities plus expected development on reported claims 36,671                  
Reinsurance | Marine and aviation | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 111,046                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8,643                  
Total of IBNR liabilities plus expected development on reported claims 89,459                  
Reinsurance | Other specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,946,010                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,971,982                  
All outstanding liabilities before 2012, net of reinsurance 7,777                  
Reinsurance | Other specialty | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 179,364 181,246 189,193 194,726 196,539 193,882 196,138 202,046 211,839 222,558
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 173,494 173,606 173,305 171,519 167,164 163,160 155,445 144,429 121,679 $ 45,663
Total of IBNR liabilities plus expected development on reported claims 2,392                  
Reinsurance | Other specialty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 201,830 204,894 210,825 211,261 213,614 212,721 216,250 226,032 252,744  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186,956 184,111 183,772 176,483 171,189 161,608 145,521 119,445 $ 57,317  
Total of IBNR liabilities plus expected development on reported claims 6,409                  
Reinsurance | Other specialty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 237,478 243,652 248,083 246,393 251,474 258,114 256,332 274,826    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 219,060 215,597 212,991 201,974 195,433 182,184 146,652 $ 68,869    
Total of IBNR liabilities plus expected development on reported claims 7,857                  
Reinsurance | Other specialty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 182,162 193,626 196,840 196,521 199,468 201,057 209,764      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 164,471 162,314 154,369 145,419 138,350 114,382 $ 54,359      
Total of IBNR liabilities plus expected development on reported claims 8,549                  
Reinsurance | Other specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 210,344 215,614 209,564 215,078 220,661 223,191        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 189,411 186,247 174,403 162,661 138,648 $ 65,055        
Total of IBNR liabilities plus expected development on reported claims 13,182                  
Reinsurance | Other specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 241,598 245,505 247,203 258,419 269,254          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 205,998 199,051 192,274 164,829 $ 73,366          
Total of IBNR liabilities plus expected development on reported claims 30,855                  
Reinsurance | Other specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 324,536 308,190 316,231 320,538            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 245,330 231,358 201,732 $ 71,167            
Total of IBNR liabilities plus expected development on reported claims 40,807                  
Reinsurance | Other specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 326,168 341,409 360,854              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 216,647 158,132 $ 79,718              
Total of IBNR liabilities plus expected development on reported claims 51,165                  
Reinsurance | Other specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 460,084 533,861                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 243,980 $ 97,617                
Total of IBNR liabilities plus expected development on reported claims 102,130                  
Reinsurance | Other specialty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 582,446                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 126,635                  
Total of IBNR liabilities plus expected development on reported claims $ 300,667