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RESERVE FOR LOSSES AND LOSS EXPENSES - Summary of Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of 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 claims and claim adjustment expenses, net of reinsurance $ 9,722,280                  
Insurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,503,262                  
Insurance | Property                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 3,327,754                  
All outstanding liabilities before 2013, net of reinsurance 12,328                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 624,924                  
Insurance | Property | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 236,997 $ 236,432 $ 233,526 $ 229,834 $ 228,191 $ 225,390 $ 214,480 $ 204,735 $ 167,580 $ 58,733
Insurance | Property | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 252,430 252,414 251,427 254,575 253,810 249,980 244,033 201,651 100,650  
Insurance | Property | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 181,344 176,515 185,314 178,913 179,204 165,616 144,649 67,511    
Insurance | Property | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 252,620 255,203 250,150 249,831 242,194 206,273 82,211      
Insurance | Property | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 630,476 640,919 645,828 617,753 509,810 190,341        
Insurance | Property | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 584,059 566,699 556,715 463,312 218,618          
Insurance | Property | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 334,179 297,493 251,353 145,706            
Insurance | Property | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 473,647 419,718 181,569              
Insurance | Property | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 284,795 133,811                
Insurance | Property | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 97,207                  
Insurance | Accident and health                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 700,459                  
All outstanding liabilities before 2013, net of reinsurance 50                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 76,862                  
Insurance | Accident and health | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 34,385 34,324 32,902 32,744 32,675 32,455 32,330 31,088 29,732 16,332
Insurance | Accident and health | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 60,773 60,364 61,428 61,556 61,226 60,571 59,416 55,506 31,094  
Insurance | Accident and health | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 61,208 61,116 60,461 60,585 59,574 58,702 55,604 30,760    
Insurance | Accident and health | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 83,896 83,188 82,791 81,731 80,888 77,102 40,548      
Insurance | Accident and health | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 113,874 114,694 113,583 112,172 106,988 62,112        
Insurance | Accident and health | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 111,146 110,259 106,590 104,196 60,816          
Insurance | Accident and health | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 67,232 62,277 60,783 44,546            
Insurance | Accident and health | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 60,375 51,948 36,155              
Insurance | Accident and health | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 61,291 39,096                
Insurance | Accident and health | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 46,279                  
Insurance | Marine and aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,127,291                  
All outstanding liabilities before 2013, net of reinsurance 15,112                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 605,168                  
Insurance | Marine and aviation | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 93,057 93,247 92,036 89,309 88,864 77,260 72,520 62,893 50,207 22,659
Insurance | Marine and aviation | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 50,668 48,832 54,548 53,363 48,895 39,607 37,098 22,841 10,323  
Insurance | Marine and aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 143,363 143,207 136,606 133,809 131,005 126,054 69,837 29,478    
Insurance | Marine and aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 97,216 94,129 92,182 90,225 82,993 50,925 22,870      
Insurance | Marine and aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 183,484 179,649 170,989 139,027 105,590 35,017        
Insurance | Marine and aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 184,154 172,496 158,852 122,623 47,056          
Insurance | Marine and aviation | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 170,142 144,781 102,330 53,681            
Insurance | Marine and aviation | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 105,653 83,842 44,436              
Insurance | Marine and aviation | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 69,711 26,908                
Insurance | Marine and aviation | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 29,843                  
Insurance | Cyber                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 388,336                  
All outstanding liabilities before 2013, net of reinsurance 9,363                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 296,401                  
Insurance | Cyber | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 29,117 28,745 28,626 28,104 25,564 24,114 21,149 18,990 10,833 2,179
Insurance | Cyber | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 36,070 35,440 33,732 33,819 31,260 29,962 23,330 12,162 3,136  
Insurance | Cyber | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 43,635 42,515 39,470 30,865 28,501 25,544 15,333 5,572    
Insurance | Cyber | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 23,207 23,136 21,333 18,502 14,141 4,637 1,348      
Insurance | Cyber | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 40,553 38,029 35,897 28,331 19,165 9,354        
Insurance | Cyber | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 19,193 14,786 9,874 7,327 2,171          
Insurance | Cyber | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 60,129 32,193 20,810 2,775            
Insurance | Cyber | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 63,216 50,038 17,712              
Insurance | Cyber | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 65,391 24,082                
Insurance | Cyber | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 7,825                  
Insurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,875,024                  
All outstanding liabilities before 2013, net of reinsurance 93,016                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,793,131                  
Insurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 257,104 255,952 241,651 229,734 212,579 185,538 151,750 108,641 61,522 15,377
Insurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 242,244 236,458 214,481 204,705 188,401 158,890 103,662 56,706 20,125  
Insurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 222,361 211,058 198,709 169,213 138,047 110,009 51,053 14,049    
Insurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 273,693 232,648 208,400 170,747 130,415 65,614 14,319      
Insurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 266,468 196,308 165,575 107,837 51,064 11,370        
Insurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 262,939 202,837 141,868 74,216 18,191          
Insurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 203,957 131,776 75,955 24,826            
Insurance | Professional lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 97,171 43,796 8,631              
Insurance | Professional lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 38,372 9,697                
Insurance | Professional lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 10,715                  
Insurance | Credit and political risk                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 275,639                  
All outstanding liabilities before 2013, net of reinsurance 607                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 102,547                  
Insurance | Credit and political risk | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 12,151 12,151 13,828 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 69,677 70,223 70,223 64,050 57,857 57,857 61,108 39,951 1,924  
Insurance | Credit and political risk | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 23,309 23,309 23,309 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 25,291 25,291 25,291 25,291 25,291 25,291 0      
Insurance | Credit and political risk | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 10,100 10,640 11,427 9,008 3,916 388        
Insurance | Credit and political risk | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 19,396 11,314 15,117 13,128 5,215          
Insurance | Credit and political risk | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 56,531 53,331 46,055 15,684            
Insurance | Credit and political risk | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 56,769 89,146 9,618              
Insurance | Credit and political risk | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses (382) 2,769                
Insurance | Credit and political risk | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 2,797                  
Insurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,056,273                  
All outstanding liabilities before 2013, net of reinsurance 50,544                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,004,229                  
Insurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 82,483 78,018 73,309 71,978 66,959 60,000 42,046 33,315 23,276 2,356
Insurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 113,142 106,197 103,033 93,562 84,362 71,582 49,818 18,623 1,409  
Insurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 158,924 150,562 140,732 120,061 92,535 39,522 22,303 5,437    
Insurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 95,688 79,464 66,237 56,367 36,336 23,237 6,308      
Insurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 168,012 142,927 115,213 58,801 29,335 5,395        
Insurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 158,358 118,945 72,091 34,803 9,321          
Insurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 138,832 83,533 39,746 7,791            
Insurance | Liability | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 75,820 25,129 8,138              
Insurance | Liability | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 51,815 13,388                
Insurance | Liability | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 13,199                  
Reinsurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,219,018                  
Reinsurance | Accident and health                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,541,288                  
All outstanding liabilities before 2013, net of reinsurance 47                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 236,094                  
Reinsurance | Accident and health | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 110,537 110,328 111,090 111,018 111,018 111,011 110,927 108,306 103,977 52,853
Reinsurance | Accident and health | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 86,702 86,319 87,239 86,553 86,466 86,266 85,870 79,933 36,558  
Reinsurance | Accident and health | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 93,677 93,864 92,441 91,981 91,872 88,667 77,264 23,404    
Reinsurance | Accident and health | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 189,679 188,726 189,128 187,142 180,978 149,883 50,036      
Reinsurance | Accident and health | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 179,772 179,117 178,605 171,864 157,032 79,209        
Reinsurance | Accident and health | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 194,276 191,161 191,605 165,053 72,863          
Reinsurance | Accident and health | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 196,306 195,575 169,257 67,728            
Reinsurance | Accident and health | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 210,006 171,632 81,657              
Reinsurance | Accident and health | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 179,025 68,381                
Reinsurance | Accident and health | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 101,308                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 227,837                  
All outstanding liabilities before 2013, net of reinsurance 2,076                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 156,073                  
Reinsurance | Marine and aviation | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 6,698 6,593 6,574 6,029 5,845 5,416 4,180 3,685 2,502 465
Reinsurance | Marine and aviation | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 7,549 7,357 6,990 6,486 6,308 5,244 4,377 2,301 1,117  
Reinsurance | Marine and aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 10,902 10,820 10,994 10,198 8,641 6,430 2,655 416    
Reinsurance | Marine and aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 34,519 33,927 32,878 30,133 26,202 19,119 2,695      
Reinsurance | Marine and aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 36,920 36,809 33,764 28,826 23,508 2,746        
Reinsurance | Marine and aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 34,293 30,685 24,246 10,831 1,779          
Reinsurance | Marine and aviation | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 52,688 34,278 27,093 10,715            
Reinsurance | Marine and aviation | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 24,112 16,729 4,017              
Reinsurance | Marine and aviation | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 12,381 5,491                
Reinsurance | Marine and aviation | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 7,775                  
Reinsurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 969,837                  
All outstanding liabilities before 2013, net of reinsurance 92,109                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 998,587                  
Reinsurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 138,470 132,401 128,090 122,775 104,549 81,423 64,795 30,381 12,023 1,059
Reinsurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 189,224 177,465 157,828 146,520 108,767 74,330 48,700 13,047 2,019  
Reinsurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 169,963 151,873 131,056 111,527 79,172 41,493 13,502 3,134    
Reinsurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 180,770 153,251 124,553 94,853 52,455 20,414 1,758      
Reinsurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 115,904 88,494 62,498 39,764 14,785 2,812        
Reinsurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 81,417 56,685 31,091 2,539 272          
Reinsurance | Professional lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 52,849 33,395 13,549 365            
Reinsurance | Professional lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 26,664 13,845 3,822              
Reinsurance | Professional lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 11,343 4,337                
Reinsurance | Professional lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 3,233                  
Reinsurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,259,615                  
All outstanding liabilities before 2013, net of reinsurance 123,029                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,504,428                  
Reinsurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 133,020 127,966 123,563 113,053 102,527 88,217 69,024 52,304 22,218 5,966
Reinsurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 147,798 136,624 129,370 109,681 89,217 69,985 48,362 28,641 7,072  
Reinsurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 151,688 141,300 130,587 108,707 80,784 54,466 27,442 7,268    
Reinsurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 188,883 166,054 142,420 111,403 69,254 37,601 11,858      
Reinsurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 192,889 158,338 120,553 78,435 42,092 12,432        
Reinsurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 166,117 127,737 85,126 49,875 19,354          
Reinsurance | Liability | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 120,278 79,739 45,266 19,305            
Reinsurance | Liability | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 82,357 49,073 16,939              
Reinsurance | Liability | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 58,524 10,942                
Reinsurance | Liability | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 18,061                  
Reinsurance | Credit and surety                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 721,279                  
All outstanding liabilities before 2013, net of reinsurance 14,199                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 231,515                  
Reinsurance | Credit and surety | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 111,765 110,508 112,241 110,064 105,102 103,368 95,770 89,348 75,085 32,161
Reinsurance | Credit and surety | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 106,252 105,054 105,238 104,858 100,457 92,889 83,972 59,703 35,281  
Reinsurance | Credit and surety | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 118,811 120,060 119,204 115,605 113,683 97,094 79,855 32,782    
Reinsurance | Credit and surety | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 99,003 99,276 100,768 99,722 90,226 71,774 41,790      
Reinsurance | Credit and surety | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 100,868 97,952 99,844 88,330 72,267 37,115        
Reinsurance | Credit and surety | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 83,907 82,182 70,623 66,694 38,682          
Reinsurance | Credit and surety | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 45,510 43,443 30,187 19,224            
Reinsurance | Credit and surety | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 39,253 33,823 25,293              
Reinsurance | Credit and surety | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 9,045 4,466                
Reinsurance | Credit and surety | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 6,865                  
Reinsurance | Motor                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,457,313                  
All outstanding liabilities before 2013, net of reinsurance 252,523                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,002,332                  
Reinsurance | Motor | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 88,695 87,158 74,002 83,161 80,462 75,368 70,288 61,273 49,088 32,749
Reinsurance | Motor | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 129,313 126,822 106,510 111,744 103,115 93,883 86,680 68,998 41,942  
Reinsurance | Motor | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 164,738 159,792 137,597 137,554 122,679 106,450 88,152 56,617    
Reinsurance | Motor | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 179,208 172,139 149,042 137,362 120,556 98,649 59,225      
Reinsurance | Motor | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 231,594 209,638 188,658 155,191 126,902 70,213        
Reinsurance | Motor | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 227,538 204,301 196,187 134,503 82,020          
Reinsurance | Motor | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 216,677 195,770 180,671 89,709            
Reinsurance | Motor | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 110,939 92,231 43,190              
Reinsurance | Motor | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 73,915 41,457                
Reinsurance | Motor | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 34,696                  
Reinsurance | Agriculture                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 1,044,595                  
All outstanding liabilities before 2013, net of reinsurance 734                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 131,369                  
Reinsurance | Agriculture | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 121,997 120,258 119,990 120,204 120,138 120,144 119,549 118,317 78,089 3,609
Reinsurance | Agriculture | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 162,061 161,161 160,509 162,005 161,492 161,569 162,343 133,132 15,615  
Reinsurance | Agriculture | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 95,599 95,444 95,455 94,860 94,523 92,967 65,858 1,716    
Reinsurance | Agriculture | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 108,792 108,752 108,991 109,511 107,972 62,155 9,489      
Reinsurance | Agriculture | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 137,343 137,396 138,555 137,421 124,479 7,444        
Reinsurance | Agriculture | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 138,316 141,688 135,594 127,514 5,115          
Reinsurance | Agriculture | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 178,181 174,173 154,480 28,854            
Reinsurance | Agriculture | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 54,180 47,316 17,454              
Reinsurance | Agriculture | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 32,781 2,953                
Reinsurance | Agriculture | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 15,345                  
Reinsurance | Run Off Lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 3,051,878                  
All outstanding liabilities before 2013, net of reinsurance 38,217                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 958,620                  
Reinsurance | Run Off Lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 245,659 244,594 240,341 241,051 240,785 239,868 232,338 207,125 137,729 $ 50,430
Reinsurance | Run Off Lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 210,684 209,411 202,701 205,235 201,136 196,310 179,797 135,883 $ 49,123  
Reinsurance | Run Off Lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 232,113 230,483 216,642 212,210 201,981 177,080 118,635 $ 46,120    
Reinsurance | Run Off Lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 257,213 251,866 245,034 230,829 199,912 141,113 $ 64,831      
Reinsurance | Run Off Lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 649,936 614,420 590,316 532,087 419,474 $ 163,361        
Reinsurance | Run Off Lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 530,773 483,699 430,939 335,059 $ 116,922          
Reinsurance | Run Off Lines | Accident Year 2019                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 318,273 281,860 220,795 $ 54,866            
Reinsurance | Run Off Lines | Accident Year 2020                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 323,592 240,691 $ 105,210              
Reinsurance | Run Off Lines | Accident Year 2021                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses 233,487 $ 87,885                
Reinsurance | Run Off Lines | Accident Year 2022                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses $ 50,148