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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, 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
Dec. 31, 2009
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 8,676,295                  
Insurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 3,540,908                  
Insurance | Property and other                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 2,817,520                  
All outstanding liabilities before 2009, net of reinsurance 5,862                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 771,659                  
Insurance | Property and other | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 77,252 $ 77,248 $ 76,980 $ 76,673 $ 74,453 $ 73,387 $ 72,499 $ 68,653 $ 60,085 $ 31,360
Insurance | Property and other | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 110,171 109,837 109,794 110,008 109,933 105,719 94,912 86,886 48,575  
Insurance | Property and other | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 270,946 270,666 269,994 270,309 271,451 249,162 192,892 84,811    
Insurance | Property and other | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 312,894 312,818 307,639 300,129 277,230 213,138 77,088      
Insurance | Property and other | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 261,266 258,435 247,393 236,405 197,898 75,214        
Insurance | Property and other | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 315,797 311,730 304,609 258,098 131,991          
Insurance | Property and other | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 239,989 225,593 201,166 98,366            
Insurance | Property and other | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 327,706 287,049 122,407              
Insurance | Property and other | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 625,027 251,358                
Insurance | Property and other | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 276,472                  
Insurance | Marine                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 588,505                  
All outstanding liabilities before 2009, net of reinsurance 8,619                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 340,668                  
Insurance | Marine | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 50,244 48,920 48,587 48,321 45,775 45,159 43,147 39,674 30,297 17,394
Insurance | Marine | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 43,433 43,346 46,940 45,976 45,194 42,364 33,298 28,631 18,029  
Insurance | Marine | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 66,913 64,868 60,572 59,862 58,025 54,930 44,218 26,435    
Insurance | Marine | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 54,721 52,724 50,331 49,523 44,800 38,545 10,711      
Insurance | Marine | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 76,856 65,822 63,128 54,898 44,087 18,982        
Insurance | Marine | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 35,987 26,924 26,838 15,172 6,349          
Insurance | Marine | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 111,027 108,152 54,869 21,426            
Insurance | Marine | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 57,745 31,981 12,486              
Insurance | Marine | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 68,563 14,472                
Insurance | Marine | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 23,016                  
Insurance | Aviation                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 178,160                  
All outstanding liabilities before 2009, net of reinsurance 8,362                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 91,404                  
Insurance | Aviation | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 13,616 13,665 13,700 14,203 14,266 13,902 12,780 7,026 3,583 2,081
Insurance | Aviation | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 8,423 8,221 8,113 7,670 7,551 6,886 6,312 4,131 1,037  
Insurance | Aviation | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 6,188 6,042 5,811 5,562 5,028 4,512 2,822 638    
Insurance | Aviation | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 7,263 7,146 6,822 5,941 4,147 2,858 953      
Insurance | Aviation | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 14,200 13,594 11,444 9,746 7,326 4,399        
Insurance | Aviation | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 14,824 14,167 11,687 8,019 3,987          
Insurance | Aviation | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 23,797 21,507 16,155 8,084            
Insurance | Aviation | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 27,120 20,113 10,407              
Insurance | Aviation | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 41,671 22,512                
Insurance | Aviation | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 21,058                  
Insurance | Credit and political risk                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 600,313                  
All outstanding liabilities before 2009, net of reinsurance (1,475)                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 99,011                  
Insurance | Credit and political risk | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 340,785 341,231 345,567 345,520 345,521 341,577 346,221 346,254 344,652 92,842
Insurance | Credit and political risk | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 102,514 102,196 102,154 101,948 101,786 106,767 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 27,631 27,631 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 42 39 38 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 13,826 11,768 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 57,855 57,855 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 23,298 23,298 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 24,479 24,445 0              
Insurance | Credit and political risk | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 5,589 1,504                
Insurance | Credit and political risk | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 4,294                  
Insurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 1,756,498                  
All outstanding liabilities before 2009, net of reinsurance 45,848                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,587,696                  
Insurance | Professional lines | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 184,577 177,492 165,088 126,542 106,985 96,631 68,690 44,065 20,619 1,657
Insurance | Professional lines | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 136,252 114,710 109,668 99,082 88,585 72,554 53,458 27,815 7,850  
Insurance | Professional lines | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 294,043 282,907 237,804 165,206 107,980 73,940 32,812 7,399    
Insurance | Professional lines | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 272,298 252,937 229,932 183,295 99,486 41,021 7,801      
Insurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 241,074 211,931 174,759 128,858 72,784 17,633        
Insurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 222,692 191,437 129,160 70,266 23,450          
Insurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 168,627 137,145 67,313 19,976            
Insurance | Professional lines | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 146,342 70,947 15,846              
Insurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 71,495 20,812                
Insurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 19,098                  
Insurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 601,478                  
All outstanding liabilities before 2009, net of reinsurance 43,840                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 650,470                  
Insurance | Liability | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 86,231 84,975 83,991 44,105 41,322 31,865 26,754 13,305 4,646 726
Insurance | Liability | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 87,981 86,433 71,788 66,114 61,029 53,581 30,788 15,966 1,030  
Insurance | Liability | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 62,152 60,263 54,996 46,074 38,376 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 46,545 42,745 37,139 30,145 15,411 5,514 1,630      
Insurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 66,976 60,017 42,051 33,320 23,281 2,360        
Insurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 84,397 71,617 49,840 18,645 1,415          
Insurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 92,557 39,557 22,308 5,438            
Insurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 36,406 23,286 6,318              
Insurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 29,529 5,404                
Insurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 8,704                  
Reinsurance                    
Claims Development [Line Items]                    
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,135,387                  
Reinsurance | Property and other                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 4,939,078                  
All outstanding liabilities before 2009, net of reinsurance 11,126                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,393,776                  
Reinsurance | Property and other | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 190,174 191,900 192,728 191,046 188,240 188,919 178,388 160,284 129,397 56,420
Reinsurance | Property and other | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 542,909 540,616 534,893 510,061 481,009 435,155 403,566 310,268 116,143  
Reinsurance | Property and other | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 1,013,191 1,010,611 995,795 922,456 893,041 793,972 587,390 251,538    
Reinsurance | Property and other | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 415,831 413,789 404,019 389,461 367,055 294,436 122,688      
Reinsurance | Property and other | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 482,114 480,712 470,990 440,804 324,443 107,085        
Reinsurance | Property and other | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 458,032 451,890 434,354 352,361 101,937          
Reinsurance | Property and other | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 400,615 368,360 265,569 71,244            
Reinsurance | Property and other | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 519,223 375,374 126,404              
Reinsurance | Property and other | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 722,835 252,008                
Reinsurance | Property and other | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 194,154                  
Reinsurance | Credit and surety                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 889,415                  
All outstanding liabilities before 2009, net of reinsurance 13,274                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 325,491                  
Reinsurance | Credit and surety | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 87,238 87,594 87,089 87,180 87,047 84,401 80,574 78,378 76,440 32,479
Reinsurance | Credit and surety | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 66,023 65,724 64,710 63,279 62,144 60,452 59,776 48,715 28,218  
Reinsurance | Credit and surety | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 89,004 87,571 85,242 83,036 78,477 70,850 54,012 22,449    
Reinsurance | Credit and surety | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 112,118 110,844 109,073 105,551 99,705 85,701 49,631      
Reinsurance | Credit and surety | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 108,062 106,202 98,517 91,902 77,059 32,447        
Reinsurance | Credit and surety | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 103,272 95,675 86,539 61,440 35,570          
Reinsurance | Credit and surety | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 117,594 100,464 82,174 32,935            
Reinsurance | Credit and surety | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 92,788 73,603 42,069              
Reinsurance | Credit and surety | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 74,341 37,311                
Reinsurance | Credit and surety | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 38,975                  
Reinsurance | Professional lines                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 911,479                  
All outstanding liabilities before 2009, net of reinsurance 47,397                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,039,085                  
Reinsurance | Professional lines | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 150,811 143,732 138,247 128,071 108,373 83,703 63,066 32,306 8,588 914
Reinsurance | Professional lines | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 137,917 130,487 123,889 107,270 76,763 52,129 31,245 12,029 1,758  
Reinsurance | Professional lines | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 129,920 119,643 102,938 84,776 57,182 30,273 11,825 1,510    
Reinsurance | Professional lines | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 131,770 107,173 85,921 53,587 29,616 10,400 779      
Reinsurance | Professional lines | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 104,883 81,641 64,966 30,495 12,070 1,062        
Reinsurance | Professional lines | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 109,129 74,542 48,814 13,066 2,019          
Reinsurance | Professional lines | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 79,270 41,524 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 52,588 20,516 1,772              
Reinsurance | Professional lines | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 14,918 2,814                
Reinsurance | Professional lines | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 273                  
Reinsurance | Motor                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 916,565                  
All outstanding liabilities before 2009, net of reinsurance 146,464                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,172,467                  
Reinsurance | Motor | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 31,650 29,144 25,910 21,368 19,066 12,933 9,523 8,012 6,830 2,709
Reinsurance | Motor | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 33,083 32,015 30,977 27,766 23,554 20,387 17,066 11,951 7,075  
Reinsurance | Motor | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 89,619 88,630 84,067 78,202 71,664 61,309 46,979 23,788    
Reinsurance | Motor | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 89,492 87,244 83,232 76,875 67,254 52,736 29,162      
Reinsurance | Motor | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 86,832 81,388 75,865 66,119 52,639 33,807        
Reinsurance | Motor | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 110,562 100,607 92,721 73,572 43,325          
Reinsurance | Motor | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 129,661 112,584 92,778 57,809            
Reinsurance | Motor | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 127,970 104,342 60,829              
Reinsurance | Motor | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 133,842 72,226                
Reinsurance | Motor | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 83,854                  
Reinsurance | Liability                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 919,946                  
All outstanding liabilities before 2009, net of reinsurance 54,315                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 1,204,568                  
Reinsurance | Liability | Accident Year 2009                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 136,539 132,996 127,009 122,704 103,662 73,229 56,623 44,473 17,102 $ 1,704
Reinsurance | Liability | Accident Year 2010                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 128,399 119,693 108,770 97,457 83,826 62,291 46,201 17,654 $ 2,481  
Reinsurance | Liability | Accident Year 2011                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 135,625 123,387 112,328 92,466 70,102 39,981 21,273 $ 5,189    
Reinsurance | Liability | Accident Year 2012                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 115,571 101,115 78,190 58,735 28,388 12,798 $ 3,541      
Reinsurance | Liability | Accident Year 2013                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 102,588 88,264 69,052 52,327 22,236 $ 5,969        
Reinsurance | Liability | Accident Year 2014                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 89,436 70,143 48,415 28,663 $ 7,083          
Reinsurance | Liability | Accident Year 2015                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 80,865 54,524 27,457 $ 7,271            
Reinsurance | Liability | Accident Year 2016                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 69,526 37,688 $ 11,861              
Reinsurance | Liability | Accident Year 2017                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance 42,092 $ 12,424                
Reinsurance | Liability | Accident Year 2018                    
Claims Development [Line Items]                    
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance $ 19,305