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RESERVE FOR LOSSES AND LOSS EXPENSES - Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance (Details) - USD ($)
$ in Thousands
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
Dec. 31, 2010
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 8,862,564                  
Insurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 3,534,458                  
Insurance | Property and other                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 3,371,989                  
All outstanding liabilities before 2010, net of reinsurance 6,225                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 579,613                  
Insurance | Property and other | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 110,970 $ 110,990 $ 110,656 $ 110,612 $ 110,819 $ 110,745 $ 106,531 $ 95,726 $ 87,604 $ 48,995
Insurance | Property and other | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 272,372 272,402 271,960 271,287 271,483 272,530 250,251 193,949 85,346  
Insurance | Property and other | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 315,703 313,602 313,529 308,368 300,845 277,909 213,961 77,461    
Insurance | Property and other | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 264,607 262,819 259,787 248,746 237,714 198,955 75,831      
Insurance | Property and other | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 318,866 317,697 313,360 306,221 259,679 132,872        
Insurance | Property and other | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 242,270 241,586 227,237 202,649 99,120          
Insurance | Property and other | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 338,243 329,709 289,711 123,640            
Insurance | Property and other | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 744,285 628,364 253,400              
Insurance | Property and other | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 577,243 284,651                
Insurance | Property and other | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 187,430                  
Insurance | Marine                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 673,651                  
All outstanding liabilities before 2010, net of reinsurance 4,296                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 350,692                  
Insurance | Marine | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 43,377 43,372 43,286 46,918 45,944 45,159 42,325 33,296 28,603 18,017
Insurance | Marine | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 67,523 67,046 65,000 60,689 59,976 58,132 55,029 44,274 26,453  
Insurance | Marine | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 55,950 54,863 52,841 50,448 49,631 44,884 38,594 10,708    
Insurance | Marine | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 76,900 76,753 65,717 63,034 54,777 43,958 18,856      
Insurance | Marine | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 40,895 36,020 26,930 26,905 15,179 6,357        
Insurance | Marine | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 112,617 111,212 108,312 54,958 21,433          
Insurance | Marine | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 63,333 57,314 31,817 12,487            
Insurance | Marine | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 92,773 68,411 14,515              
Insurance | Marine | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 84,834 25,153                
Insurance | Marine | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 35,449                  
Insurance | Aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 211,595                  
All outstanding liabilities before 2010, net of reinsurance 7,260                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 86,940                  
Insurance | Aviation | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 8,574 8,391 8,198 8,109 7,666 7,548 6,883 6,309 4,126 1,032
Insurance | Aviation | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 6,222 6,177 6,035 5,814 5,564 5,030 4,513 2,822 639  
Insurance | Aviation | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 7,102 7,166 7,053 6,831 5,948 4,152 2,861 954    
Insurance | Aviation | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 14,487 14,167 13,560 11,450 9,749 7,328 4,400      
Insurance | Aviation | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 14,848 14,485 13,849 11,692 8,023 3,988        
Insurance | Aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 24,676 23,217 20,959 16,159 8,085          
Insurance | Aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 27,820 26,259 19,279 10,412            
Insurance | Aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 50,642 40,159 21,105              
Insurance | Aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 40,368 21,442                
Insurance | Aviation | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 16,856                  
Insurance | Credit and political risk                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 294,917                  
All outstanding liabilities before 2010, net of reinsurance (2,588)                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 98,219                  
Insurance | Credit and political risk | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 101,262 102,522 102,203 102,157 101,951 101,789 106,768 90,729 85,418 50,000
Insurance | Credit and political risk | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 27,636 27,636 27,636 27,636 27,636 27,636 27,636 37,205 32,788  
Insurance | Credit and political risk | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 43 43 41 39 0 0 0 0    
Insurance | Credit and political risk | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 13,828 13,828 11,769 5,216 3,726 2,235 745      
Insurance | Credit and political risk | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 64,050 57,858 57,858 61,108 39,952 1,924        
Insurance | Credit and political risk | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 23,309 23,309 23,309 23,309 0          
Insurance | Credit and political risk | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 24,697 24,697 24,697 0            
Insurance | Credit and political risk | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 11,019 5,593 1,523              
Insurance | Credit and political risk | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 13,545 4,937                
Insurance | Credit and political risk | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 15,528                  
Insurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 1,875,919                  
All outstanding liabilities before 2010, net of reinsurance 65,486                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,680,272                  
Insurance | Professional lines | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 142,788 136,510 114,520 109,540 99,039 88,558 72,592 53,493 27,806 7,807
Insurance | Professional lines | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 302,151 294,678 283,510 238,401 165,806 108,598 74,461 32,897 7,402  
Insurance | Professional lines | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 281,715 273,383 253,958 230,913 184,191 100,089 41,328 7,818    
Insurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 263,325 242,860 213,225 175,835 129,671 73,077 17,690      
Insurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 242,899 223,838 192,405 130,039 70,662 23,529        
Insurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 203,542 169,555 137,738 67,725 20,197          
Insurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 192,459 147,370 71,245 15,859            
Insurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 139,143 71,779 20,946              
Insurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 81,986 20,091                
Insurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 25,911                  
Insurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 648,147                  
All outstanding liabilities before 2010, net of reinsurance 50,617                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 738,722                  
Insurance | Liability | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 88,476 88,007 86,454 71,803 66,129 61,044 53,594 30,800 15,977 1,030
Insurance | Liability | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 67,114 62,150 60,261 54,996 46,074 38,377 20,190 10,540 2,761  
Insurance | Liability | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 48,034 46,540 42,740 37,139 30,145 15,411 5,514 1,663    
Insurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 71,982 66,963 60,004 42,049 33,319 23,280 2,359      
Insurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 93,574 84,374 71,595 49,836 18,640 1,414        
Insurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 120,216 92,664 39,637 22,392 5,438          
Insurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 56,446 36,385 23,280 6,319            
Insurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 59,356 29,564 5,439              
Insurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 35,612 9,027                
Insurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 7,337                  
Reinsurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,328,106                  
Reinsurance | Property and other                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 5,596,838                  
All outstanding liabilities before 2010, net of reinsurance 14,757                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,644,046                  
Reinsurance | Property and other | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 546,691 542,590 540,312 534,590 509,769 480,734 434,908 404,287 311,052 116,132
Reinsurance | Property and other | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 1,019,917 1,013,858 1,011,283 996,481 923,166 893,746 794,575 587,047 251,855  
Reinsurance | Property and other | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 428,152 415,634 413,594 403,926 389,373 366,968 294,298 122,823    
Reinsurance | Property and other | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 483,105 482,480 481,066 471,380 441,138 324,839 107,628      
Reinsurance | Property and other | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 463,342 458,350 452,193 434,769 352,883 102,356        
Reinsurance | Property and other | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 413,477 400,980 368,698 265,896 71,477          
Reinsurance | Property and other | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 563,781 520,779 376,920 128,126            
Reinsurance | Property and other | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 868,458 723,826 252,360              
Reinsurance | Property and other | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 648,622 195,707                
Reinsurance | Property and other | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 161,293                  
Reinsurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 945,996                  
All outstanding liabilities before 2010, net of reinsurance 52,321                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 969,167                  
Reinsurance | Professional lines | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 142,994 138,047 130,610 123,981 107,363 76,798 52,138 31,243 12,026 1,757
Reinsurance | Professional lines | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 136,492 130,059 119,767 103,052 84,845 57,230 30,272 11,822 1,510  
Reinsurance | Professional lines | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 145,866 131,853 107,224 85,972 53,629 29,622 10,392 778    
Reinsurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 123,282 104,904 81,630 64,958 30,491 12,073 1,064      
Reinsurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 147,194 109,239 74,577 48,854 13,073 2,019        
Reinsurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 112,042 79,296 41,539 13,505 3,134          
Reinsurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 95,283 52,617 20,534 1,768            
Reinsurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 39,915 14,921 2,813              
Reinsurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 2,593 271                
Reinsurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 335                  
Reinsurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 989,389                  
All outstanding liabilities before 2010, net of reinsurance 80,768                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,228,290                  
Reinsurance | Liability | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 130,566 128,386 119,678 108,748 97,430 83,792 62,287 46,199 17,652 2,479
Reinsurance | Liability | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 141,483 135,627 123,403 112,347 92,477 70,083 40,009 21,291 5,197  
Reinsurance | Liability | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 125,979 115,618 101,164 78,235 58,777 28,384 12,800 3,541    
Reinsurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 113,127 102,593 88,262 69,055 52,328 22,235 5,971      
Reinsurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 109,974 89,412 70,138 48,420 28,661 7,083        
Reinsurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 108,961 80,865 54,517 27,455 7,270          
Reinsurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 111,870 69,558 37,703 11,874            
Reinsurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 78,477 42,147 12,438              
Reinsurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 49,795 19,303                
Reinsurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 19,157                  
Reinsurance | Credit and surety                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 886,173                  
All outstanding liabilities before 2010, net of reinsurance 16,847                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 256,999                  
Reinsurance | Credit and surety | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 65,781 65,346 65,024 64,020 62,585 61,466 59,804 59,074 48,274 28,190
Reinsurance | Credit and surety | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 88,615 87,799 86,419 84,106 81,930 77,392 69,851 53,392 22,411  
Reinsurance | Credit and surety | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 113,402 111,441 110,150 108,391 104,876 99,046 85,228 49,482    
Reinsurance | Credit and surety | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 112,520 107,555 105,692 98,039 91,486 76,743 32,399      
Reinsurance | Credit and surety | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 107,082 102,670 95,079 85,984 61,076 35,552        
Reinsurance | Credit and surety | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 118,670 116,756 99,774 81,685 32,907          
Reinsurance | Credit and surety | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 101,822 92,187 73,201 42,028            
Reinsurance | Credit and surety | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 90,495 73,944 37,295              
Reinsurance | Credit and surety | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 68,505 38,990                
Reinsurance | Credit and surety | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 19,281                  
Reinsurance | Motor                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 1,146,305                  
All outstanding liabilities before 2010, net of reinsurance 193,345                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,229,604                  
Reinsurance | Motor | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 37,041 34,839 33,769 32,717 29,429 25,153 21,713 18,149 12,601 $ 7,201
Reinsurance | Motor | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 94,155 92,201 91,165 86,466 80,349 73,562 62,861 47,991 $ 23,943  
Reinsurance | Motor | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 93,194 91,982 89,646 85,488 78,880 68,970 53,959 $ 29,381    
Reinsurance | Motor | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 93,234 90,165 84,512 78,744 68,502 54,274 $ 34,133      
Reinsurance | Motor | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 124,157 114,300 103,909 95,563 75,543 $ 43,628        
Reinsurance | Motor | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 149,813 133,528 115,903 95,172 $ 58,231          
Reinsurance | Motor | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 150,004 131,606 106,934 $ 61,321            
Reinsurance | Motor | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 168,855 137,217 $ 72,859              
Reinsurance | Motor | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 145,561 $ 84,564                
Reinsurance | Motor | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 90,291