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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Thousands
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
Dec. 31, 2011
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 11,923,393                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,483,009                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 901,474                  
All outstanding liabilities before 2008, net of reinsurance 303,572                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,885,107                  
Reinsurance | Casualty | 2011                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 126,543 $ 130,769 $ 129,307 $ 132,142 $ 138,257 $ 141,023 $ 145,259 $ 149,799 $ 155,796 $ 152,359
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,463 82,728 76,722 71,457 64,486 55,027 38,998 21,684 11,509 2,353
Total of IBNR liabilities plus expected development on reported claims 16,905                  
Reinsurance | Casualty | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 122,312 123,884 120,655 111,938 117,551 127,563 139,762 143,950 145,770  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 76,287 70,308 59,877 48,109 36,809 25,738 14,875 8,637 1,371  
Total of IBNR liabilities plus expected development on reported claims 28,208                  
Reinsurance | Casualty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 137,978 133,857 137,591 139,221 151,340 157,804 161,993 168,738    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 77,089 71,150 63,415 54,797 43,263 23,209 10,050 2,549    
Total of IBNR liabilities plus expected development on reported claims 37,566                  
Reinsurance | Casualty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 243,067 242,792 233,033 236,505 222,220 224,801 219,506      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 135,101 114,798 91,366 63,636 40,949 16,160 3,962      
Total of IBNR liabilities plus expected development on reported claims 48,039                  
Reinsurance | Casualty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 251,747 244,861 240,886 233,644 224,525 225,908        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 120,889 97,007 71,231 47,381 20,340 4,490        
Total of IBNR liabilities plus expected development on reported claims 63,133                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 275,966 268,880 254,032 229,862 217,499          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 114,096 86,989 51,822 25,720 5,763          
Total of IBNR liabilities plus expected development on reported claims 65,394                  
Reinsurance | Casualty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 297,998 269,434 253,959 268,353            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 108,591 59,377 29,414 6,441            
Total of IBNR liabilities plus expected development on reported claims 79,858                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 286,944 296,507 282,010              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 106,454 31,118 7,588              
Total of IBNR liabilities plus expected development on reported claims 81,666                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 347,126 338,581                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 57,682 15,824                
Total of IBNR liabilities plus expected development on reported claims 178,981                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 393,328                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17,822                  
Total of IBNR liabilities plus expected development on reported claims 333,679                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 696,183                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 421,635                  
All outstanding liabilities before 2008, net of reinsurance 1,624                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 276,172                  
Reinsurance | Property catastrophe | 2011                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 150,459 150,971 152,082 156,150 158,465 159,174 162,993 176,170 195,232 215,493
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 148,403 148,929 148,338 147,929 145,774 143,141 137,400 122,060 89,042 63,175
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 96,637 97,252 97,143 99,178 99,998 102,254 108,787 123,288 150,570  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 95,521 95,419 94,732 94,122 92,993 90,834 83,929 70,843 25,850  
Total of IBNR liabilities plus expected development on reported claims 132                  
Reinsurance | Property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 29,060 28,910 29,848 30,567 33,143 37,714 49,507 69,044    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 29,846 29,119 29,117 28,859 26,953 24,911 19,701 12,283    
Total of IBNR liabilities plus expected development on reported claims (132)                  
Reinsurance | Property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 20,845 20,957 21,671 23,491 26,438 32,188 46,774      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 20,146 19,993 19,786 20,170 19,293 20,635 13,702      
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 4,102 4,746 6,643 12,724 19,282 34,895        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,630 2,537 2,959 2,660 (1,825) (3,161)        
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 9,027 11,487 15,313 19,556 26,671          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,803 4,515 3,057 2,646 (6,752)          
Total of IBNR liabilities plus expected development on reported claims 1,302                  
Reinsurance | Property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 32,747 46,354 49,340 82,521            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 24,209 34,534 30,224 30,173            
Total of IBNR liabilities plus expected development on reported claims 87                  
Reinsurance | Property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 44,448 63,106 75,309              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 26,189 14,232 25,505              
Total of IBNR liabilities plus expected development on reported claims 5,855                  
Reinsurance | Property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 35,789 51,202                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17,393 3,878                
Total of IBNR liabilities plus expected development on reported claims 9,545                  
Reinsurance | Property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 273,069                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 53,495                  
Total of IBNR liabilities plus expected development on reported claims 50,368                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,781,941                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,206,994                  
All outstanding liabilities before 2008, net of reinsurance 6,125                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 581,072                  
Reinsurance | Property excluding property catastrophe | 2011                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 152,753 154,261 155,606 156,647 158,952 160,264 164,414 168,122 180,624 208,318
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 150,417 151,322 150,302 150,028 149,788 148,684 146,626 142,081 122,137 47,949
Total of IBNR liabilities plus expected development on reported claims 801                  
Reinsurance | Property excluding property catastrophe | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 103,596 109,122 111,722 113,201 115,425 119,838 124,408 122,552 156,980  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 103,076 103,216 103,274 104,091 103,452 102,445 93,752 78,416 26,158  
Total of IBNR liabilities plus expected development on reported claims 251                  
Reinsurance | Property excluding property catastrophe | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 63,769 62,949 64,162 64,950 66,669 71,100 77,474 116,130    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 62,591 61,601 56,090 54,202 53,389 50,208 43,068 26,068    
Total of IBNR liabilities plus expected development on reported claims 770                  
Reinsurance | Property excluding property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 82,899 84,679 88,994 91,272 99,891 118,056 144,299      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 79,009 79,146 78,753 77,098 72,133 63,144 23,641      
Total of IBNR liabilities plus expected development on reported claims 2,063                  
Reinsurance | Property excluding property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 177,928 188,992 189,702 185,288 189,735 215,856        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 160,271 166,632 161,447 150,207 119,578 75,725        
Total of IBNR liabilities plus expected development on reported claims 12,275                  
Reinsurance | Property excluding property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 141,789 138,008 139,032 147,154 178,103          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 113,336 105,486 99,954 96,174 33,418          
Total of IBNR liabilities plus expected development on reported claims 15,986                  
Reinsurance | Property excluding property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 223,442 231,062 245,333 262,387            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 156,523 148,638 118,658 25,807            
Total of IBNR liabilities plus expected development on reported claims 17,528                  
Reinsurance | Property excluding property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 238,162 241,754 223,917              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 153,599 108,263 29,724              
Total of IBNR liabilities plus expected development on reported claims 18,520                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 209,696 219,130                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 125,698 43,809                
Total of IBNR liabilities plus expected development on reported claims 32,266                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 387,907                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 102,474                  
Total of IBNR liabilities plus expected development on reported claims 167,596                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 349,883                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 183,055                  
All outstanding liabilities before 2008, net of reinsurance 16,534                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 183,362                  
Reinsurance | Marine and aviation | 2011                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 23,517 23,792 24,871 27,264 27,213 28,811 32,436 35,889 32,956 39,359
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 21,979 21,973 21,911 21,988 16,634 15,959 19,235 16,530 12,122 4,421
Total of IBNR liabilities plus expected development on reported claims 1,317                  
Reinsurance | Marine and aviation | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 41,316 43,165 46,183 49,865 51,223 52,428 55,172 58,956 59,117  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 38,257 38,164 37,871 36,379 35,174 33,428 27,623 11,480 2,664  
Total of IBNR liabilities plus expected development on reported claims 2,228                  
Reinsurance | Marine and aviation | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 31,087 34,806 35,248 35,993 36,101 37,545 38,509 39,538    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 24,520 24,804 24,427 23,135 22,111 19,075 14,330 5,109    
Total of IBNR liabilities plus expected development on reported claims 5,039                  
Reinsurance | Marine and aviation | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 22,347 23,695 24,050 26,059 27,763 29,576 31,333      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16,253 15,376 14,939 12,748 11,872 8,221 4,373      
Total of IBNR liabilities plus expected development on reported claims 5,044                  
Reinsurance | Marine and aviation | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 28,618 30,964 31,910 31,953 37,875 34,066        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22,456 22,773 20,971 19,120 13,476 11        
Total of IBNR liabilities plus expected development on reported claims 4,738                  
Reinsurance | Marine and aviation | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 17,029 19,344 23,622 22,804 27,409          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 5,900 3,292 552 (1,655) (7,300)          
Total of IBNR liabilities plus expected development on reported claims 8,230                  
Reinsurance | Marine and aviation | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 20,853 23,878 26,407 28,868            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11,037 9,372 6,546 1,659            
Total of IBNR liabilities plus expected development on reported claims 6,783                  
Reinsurance | Marine and aviation | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 24,957 26,395 28,355              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11,384 7,087 2,006              
Total of IBNR liabilities plus expected development on reported claims 7,490                  
Reinsurance | Marine and aviation | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 55,921 49,466                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 21,930 11,015                
Total of IBNR liabilities plus expected development on reported claims 17,208                  
Reinsurance | Marine and aviation | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 84,238                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9,339                  
Total of IBNR liabilities plus expected development on reported claims 58,896                  
Reinsurance | Other specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,657,098                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,759,059                  
All outstanding liabilities before 2008, net of reinsurance 8,956                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 906,995                  
Reinsurance | Other specialty | 2011                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 87,648 89,163 88,820 90,727 91,334 92,703 94,512 96,117 100,395 115,554
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 85,854 85,643 85,960 84,815 82,468 80,642 77,018 72,298 59,715 $ 29,717
Total of IBNR liabilities plus expected development on reported claims 1,058                  
Reinsurance | Other specialty | 2012                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 187,908 196,309 202,085 203,898 200,945 203,114 209,355 219,627 231,531  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 179,943 179,614 177,742 173,202 169,096 161,073 149,753 126,138 $ 47,484  
Total of IBNR liabilities plus expected development on reported claims 4,635                  
Reinsurance | Other specialty | 2013                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 210,455 216,579 216,861 219,314 218,354 222,046 232,427 259,594    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 189,147 188,746 181,279 175,892 166,100 149,617 122,813 $ 58,962    
Total of IBNR liabilities plus expected development on reported claims 10,351                  
Reinsurance | Other specialty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 250,825 255,341 253,373 258,595 265,417 263,653 283,138      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 221,978 219,234 207,965 201,189 187,560 151,115 $ 71,006      
Total of IBNR liabilities plus expected development on reported claims 15,127                  
Reinsurance | Other specialty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 201,046 204,458 204,179 207,220 208,927 217,666        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 168,314 160,243 150,969 143,690 118,770 $ 56,438        
Total of IBNR liabilities plus expected development on reported claims 19,996                  
Reinsurance | Other specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 223,777 217,054 222,788 228,501 231,160          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 192,947 180,542 168,425 143,624 $ 67,730          
Total of IBNR liabilities plus expected development on reported claims 18,179                  
Reinsurance | Other specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 259,041 260,051 271,084 282,024            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 209,005 201,378 171,632 $ 76,847            
Total of IBNR liabilities plus expected development on reported claims 40,904                  
Reinsurance | Other specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 326,027 334,567 338,298              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 243,257 211,954 $ 75,395              
Total of IBNR liabilities plus expected development on reported claims 53,316                  
Reinsurance | Other specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 358,997 378,545                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 167,055 $ 84,416                
Total of IBNR liabilities plus expected development on reported claims 80,438                  
Reinsurance | Other specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 551,374                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 101,559                  
Total of IBNR liabilities plus expected development on reported claims $ 259,496