XML 26 R78.htm IDEA: XBRL DOCUMENT v3.20.1
Insurance Operations - Incurred and Paid Claims Development (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Claims Development [Line Items]                    
Claims incurred reported $ 3,097,846                  
IBNR 906,120                  
Claims paid 1,829,355                  
Incurred less paid 1,268,491                  
Reserves 2009 and prior 3,154 $ (5,017) $ 20,318              
Other 14,240                  
Total net reserve for unpaid losses and loss adjustment expenses 1,327,696 1,211,517 1,057,081 $ 989,968            
ULAE reserves 45,600                  
Discounting of loss reserves (47,400)                  
Retroactive reinsurance agreements 12,300                  
Allowance for uncollectible reinsurance 500                  
Other 3,200                  
Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 810,871                  
IBNR 123,551                  
Claims paid 606,684                  
Incurred less paid 204,187                  
Reserves 2009 and prior   (15,600) 33,200              
General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 940,083                  
IBNR 376,477                  
Claims paid 473,539                  
Incurred less paid 466,544                  
Reserves 2009 and prior 11,300 16,500                
Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 725,515                  
IBNR 303,187                  
Claims paid 277,963                  
Incurred less paid 447,552                  
Reserves 2009 and prior (22,800) (14,400) (12,400)              
Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 226,257                  
IBNR 69,653                  
Claims paid 129,593                  
Incurred less paid 96,664                  
Reserves 2009 and prior 16,400 12,200                
All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 395,120                  
IBNR 33,252                  
Claims paid 341,576                  
Incurred less paid 53,544                  
Accident Years 2009 and Prior                    
Claims Development [Line Items]                    
Reserves 2009 and prior 44,965                  
Prior Years                    
Claims Development [Line Items]                    
IBNR 15,481                  
Prior Years | General Liability                    
Claims Development [Line Items]                    
IBNR 7,384                  
Prior Years | Workers' Compensation                    
Claims Development [Line Items]                    
IBNR 5,590                  
Prior Years | All Other Lines                    
Claims Development [Line Items]                    
IBNR 2,507                  
Accident Year 2010                    
Claims Development [Line Items]                    
Claims incurred reported 150,543 148,117 145,444 152,840 $ 143,344 $ 136,115 $ 134,307 $ 134,941 $ 137,994 $ 131,617
IBNR $ 3,108                  
Cumulative claim counts | item 3,926                  
Claims paid $ 140,927 137,470 132,525 125,646 114,140 102,016 85,754 72,312 38,723 11,912
Accident Year 2010 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported $ 19,282 19,280 19,437 19,046 18,688 18,717 17,334 18,011 17,710 13,046
Cumulative claim counts | item 874                  
Claims paid $ 19,162 19,138 19,098 18,074 17,829 17,275 13,723 12,346 7,866 3,105
Accident Year 2010 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 69,586 68,905 66,226 72,902 69,103 62,270 63,596 64,210 59,577 56,373
IBNR $ 746                  
Cumulative claim counts | item 1,682                  
Claims paid $ 76,201 74,101 70,235 66,332 61,716 50,830 44,087 34,045 14,901 1,692
Accident Year 2010 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 30,457 28,597 28,135 28,260 25,825 25,751 23,643 26,970 23,206 24,965
IBNR $ 2,361                  
Cumulative claim counts | item 78                  
Claims paid $ 11,908 10,695 9,706 7,830 6,165 4,427 2,907 1,633 180  
Accident Year 2010 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 31,218 31,335 31,647 32,631 29,727 29,377 29,735 25,750 37,501 37,233
IBNR $ 1                  
Cumulative claim counts | item 1,292                  
Claims paid $ 33,656 33,536 33,485 33,410 28,429 29,484 25,038 24,288 15,776 $ 7,115
Accident Year 2011                    
Claims Development [Line Items]                    
Claims incurred reported 131,360 131,385 124,798 131,081 124,543 122,773 126,752 128,879 115,644  
IBNR $ 3,772                  
Cumulative claim counts | item 4,419                  
Claims paid $ 111,247 109,007 105,584 98,411 88,243 76,731 65,103 51,006 14,796  
Accident Year 2011 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported $ 12,476 12,476 12,508 12,547 12,547 11,231 11,260 13,462 13,864  
Cumulative claim counts | item 1,219                  
Claims paid $ 12,128 12,117 12,123 12,005 11,587 9,111 7,250 7,791 4,717  
Accident Year 2011 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 64,682 66,641 62,127 67,791 63,264 60,375 61,398 58,633 45,894  
IBNR $ 1,254                  
Cumulative claim counts | item 1,532                  
Claims paid $ 57,932 56,659 54,250 50,136 44,166 37,344 30,123 18,912 5,009  
Accident Year 2011 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 23,750 21,247 18,986 21,943 19,489 21,411 23,576 22,186 28,987  
IBNR $ 2,508                  
Cumulative claim counts | item 202                  
Claims paid $ 10,841 9,971 8,978 8,662 7,239 5,503 5,127 4,148 473  
Accident Year 2011 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 2 2 2 6 6 7 11      
Claims paid 2 2 2              
Accident Year 2011 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 30,450 31,018 31,176 28,794 29,238 29,749 30,507 34,597 26,899  
IBNR $ 10                  
Cumulative claim counts | item 1,466                  
Claims paid $ 30,344 30,259 30,231 27,608 25,251 24,773 22,603 20,155 $ 4,597  
Accident Year 2012                    
Claims Development [Line Items]                    
Claims incurred reported 158,523 159,120 156,355 165,889 165,015 157,985 157,477 137,380    
IBNR $ 6,491                  
Cumulative claim counts | item 6,622                  
Claims paid $ 139,793 136,909 130,200 119,374 98,960 73,249 48,276 16,619    
Accident Year 2012 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 39,231 41,572 41,479 42,028 43,031 36,319 29,959 21,101    
IBNR $ 444                  
Cumulative claim counts | item 1,746                  
Claims paid $ 38,657 41,305 40,852 39,680 33,248 25,280 15,397 6,660    
Accident Year 2012 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 50,509 48,096 46,312 45,771 42,401 38,288 43,677 42,685    
IBNR $ 1,998                  
Cumulative claim counts | item 1,483                  
Claims paid $ 45,509 40,754 36,521 32,585 24,257 14,751 8,844 945    
Accident Year 2012 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 38,919 38,835 38,501 47,373 48,983 53,038 51,724 46,503    
IBNR $ 4,017                  
Cumulative claim counts | item 1,770                  
Claims paid $ 26,237 25,495 23,694 18,468 14,634 10,598 5,481 2,381    
Accident Year 2012 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported $ 813 813 813 39 49 73 94 96    
Cumulative claim counts | item 5                  
Claims paid $ 813 813 813 2 1 1        
Accident Year 2012 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 29,051 29,803 29,250 30,678 30,551 30,266 32,022 26,995    
IBNR $ 32                  
Cumulative claim counts | item 1,618                  
Claims paid $ 28,577 28,542 28,319 28,639 26,821 22,619 18,554 $ 6,634    
Accident Year 2013                    
Claims Development [Line Items]                    
Claims incurred reported 249,802 237,900 243,567 251,353 232,660 222,277 210,368      
IBNR $ 16,133                  
Cumulative claim counts | item 13,229                  
Claims paid $ 214,863 192,476 181,989 158,978 115,396 74,012 27,465      
Accident Year 2013 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 81,422 72,265 76,768 77,570 63,764 50,752 47,191      
IBNR $ 993                  
Cumulative claim counts | item 6,224                  
Claims paid $ 79,066 71,010 72,906 64,073 43,403 26,773 13,015      
Accident Year 2013 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 69,565 61,796 60,613 70,459 62,618 61,785 48,466      
IBNR $ 7,755                  
Cumulative claim counts | item 2,608                  
Claims paid $ 66,439 55,148 46,821 36,493 22,152 10,941 1,930      
Accident Year 2013 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 64,727 69,729 71,532 68,109 70,939 71,683 76,844      
IBNR $ 7,141                  
Cumulative claim counts | item 2,694                  
Claims paid $ 35,793 32,962 29,036 26,088 20,520 12,579 2,639      
Accident Year 2013 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 8,198 8,250 8,226 1,442 1,051 1,065 968      
IBNR $ 19                  
Cumulative claim counts | item 54                  
Claims paid $ 8,157 8,149 8,083 754 312 192 43      
Accident Year 2013 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 25,890 25,859 26,428 33,773 34,287 36,992 36,900      
IBNR $ 225                  
Cumulative claim counts | item 1,649                  
Claims paid $ 25,408 25,206 25,144 31,569 29,009 23,526 $ 9,838      
Accident Year 2014                    
Claims Development [Line Items]                    
Claims incurred reported 356,733 342,788 333,865 323,792 312,987 286,842        
IBNR $ 30,978                  
Cumulative claim counts | item 16,333                  
Claims paid $ 280,933 250,928 217,986 166,907 111,919 44,738        
Accident Year 2014 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 113,790 113,747 112,157 105,528 95,283 74,185        
IBNR $ 843                  
Cumulative claim counts | item 8,231                  
Claims paid $ 110,883 108,102 96,385 74,431 52,048 21,692        
Accident Year 2014 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 114,976 104,281 93,468 78,801 77,255 70,878        
IBNR $ 15,352                  
Cumulative claim counts | item 3,093                  
Claims paid $ 73,491 53,712 41,079 28,581 14,032 5,456        
Accident Year 2014 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 67,784 69,886 74,134 83,543 81,628 88,181        
IBNR $ 12,581                  
Cumulative claim counts | item 2,679                  
Claims paid $ 42,423 39,846 35,131 24,411 14,901 4,644        
Accident Year 2014 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 30,172 27,126 25,915 16,448 15,884 13,037        
IBNR $ 1,326                  
Cumulative claim counts | item 614                  
Claims paid $ 26,366 22,880 20,545 7,358 4,271 1,795        
Accident Year 2014 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 30,011 27,749 28,192 39,473 42,938 40,562        
IBNR $ 876                  
Cumulative claim counts | item 1,716                  
Claims paid $ 27,770 26,388 24,846 32,126 26,667 $ 11,150        
Accident Year 2015                    
Claims Development [Line Items]                    
Claims incurred reported 430,942 395,751 407,427 407,279 384,269          
IBNR $ 44,665                  
Cumulative claim counts | item 20,869                  
Claims paid $ 331,748 281,637 234,756 159,708 75,043          
Accident Year 2015 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 155,266 146,757 152,268 139,415 120,137          
IBNR $ 1,981                  
Cumulative claim counts | item 11,153                  
Claims paid $ 142,806 126,831 107,063 74,524 37,964          
Accident Year 2015 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 93,808 80,514 78,163 80,411 80,225          
IBNR $ 21,362                  
Cumulative claim counts | item 3,007                  
Claims paid $ 61,168 39,407 25,931 14,720 5,404          
Accident Year 2015 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 87,570 82,212 89,383 101,410 101,762          
IBNR $ 14,957                  
Cumulative claim counts | item 3,881                  
Claims paid $ 38,061 33,543 27,423 18,434 6,504          
Accident Year 2015 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 24,144 18,345 17,952 27,542 27,876          
IBNR $ 4,825                  
Cumulative claim counts | item 1,015                  
Claims paid $ 20,676 14,293 8,949 14,751 6,879          
Accident Year 2015 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 70,154 67,924 69,660 58,501 54,269          
IBNR $ 1,540                  
Cumulative claim counts | item 1,813                  
Claims paid $ 69,037 67,563 65,390 37,279 $ 18,292          
Accident Year 2016                    
Claims Development [Line Items]                    
Claims incurred reported 416,266 406,204 423,538 390,430            
IBNR $ 93,163                  
Cumulative claim counts | item 20,049                  
Claims paid $ 266,496 204,589 150,198 78,271            
Accident Year 2016 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 124,166 119,931 124,760 114,568            
IBNR $ 6,229                  
Cumulative claim counts | item 9,642                  
Claims paid $ 102,003 83,161 63,123 39,580            
Accident Year 2016 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 91,228 92,401 101,479 93,737            
IBNR $ 28,786                  
Cumulative claim counts | item 2,868                  
Claims paid $ 47,333 25,223 13,873 3,547            
Accident Year 2016 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 102,716 103,382 109,623 99,292            
IBNR $ 47,500                  
Cumulative claim counts | item 4,358                  
Claims paid $ 43,171 35,385 24,557 10,891            
Accident Year 2016 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 44,758 34,883 30,379 34,010            
IBNR $ 8,295                  
Cumulative claim counts | item 1,190                  
Claims paid $ 27,870 16,715 7,028 4,974            
Accident Year 2016 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 53,398 55,607 57,296 48,824            
IBNR $ 2,353                  
Cumulative claim counts | item 1,991                  
Claims paid $ 46,119 44,104 41,618 $ 19,279            
Accident Year 2017                    
Claims Development [Line Items]                    
Claims incurred reported 339,505 361,299 354,948              
IBNR $ 127,760                  
Cumulative claim counts | item 18,582                  
Claims paid $ 163,937 116,204 54,026              
Accident Year 2017 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 71,068 79,156 81,986              
IBNR $ 12,343                  
Cumulative claim counts | item 7,061                  
Claims paid $ 47,199 34,659 19,950              
Accident Year 2017 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 94,554 100,306 99,845              
IBNR $ 50,712                  
Cumulative claim counts | item 2,921                  
Claims paid $ 26,354 11,279 2,596              
Accident Year 2017 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 93,134 101,691 102,250              
IBNR $ 52,781                  
Cumulative claim counts | item 4,678                  
Claims paid $ 30,776 22,462 8,631              
Accident Year 2017 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 44,260 44,044 37,760              
IBNR $ 8,921                  
Cumulative claim counts | item 1,431                  
Claims paid $ 27,816 19,733 7,270              
Accident Year 2017 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 36,489 36,102 33,108              
IBNR $ 3,003                  
Cumulative claim counts | item 2,491                  
Claims paid $ 31,792 28,070 $ 15,580              
Accident Year 2018                    
Claims Development [Line Items]                    
Claims incurred reported 406,199 422,104                
IBNR $ 233,890                  
Cumulative claim counts | item 18,720                  
Claims paid $ 112,889 45,012                
Accident Year 2018 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 78,777 87,993                
IBNR $ 28,210                  
Cumulative claim counts | item 7,146                  
Claims paid $ 32,698 16,709                
Accident Year 2018 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 137,525 142,486                
IBNR $ 101,954                  
Cumulative claim counts | item 2,949                  
Claims paid $ 15,625 2,223                
Accident Year 2018 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 118,973 116,278                
IBNR $ 77,694                  
Cumulative claim counts | item 5,125                  
Claims paid $ 29,008 9,563                
Accident Year 2018 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 37,015 39,507                
IBNR $ 20,432                  
Cumulative claim counts | item 1,184                  
Claims paid $ 11,953 5,323                
Accident Year 2018 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 33,909 35,839                
IBNR $ 5,600                  
Cumulative claim counts | item 2,316                  
Claims paid $ 23,605 $ 11,194                
Accident Year 2019                    
Claims Development [Line Items]                    
Claims incurred reported 457,973                  
IBNR $ 330,679                  
Cumulative claim counts | item 17,591                  
Claims paid $ 66,522                  
Accident Year 2019 | Commercial Auto                    
Claims Development [Line Items]                    
Claims incurred reported 115,393                  
IBNR $ 72,508                  
Cumulative claim counts | item 8,141                  
Claims paid $ 22,082                  
Accident Year 2019 | General Liability                    
Claims Development [Line Items]                    
Claims incurred reported 153,650                  
IBNR $ 139,174                  
Cumulative claim counts | item 2,309                  
Claims paid $ 3,487                  
Accident Year 2019 | Workers' Compensation                    
Claims Development [Line Items]                    
Claims incurred reported 97,485                  
IBNR $ 76,057                  
Cumulative claim counts | item 4,468                  
Claims paid $ 9,745                  
Accident Year 2019 | Commercial Multiple Peril                    
Claims Development [Line Items]                    
Claims incurred reported 36,895                  
IBNR $ 25,835                  
Cumulative claim counts | item 935                  
Claims paid $ 5,940                  
Accident Year 2019 | All Other Lines                    
Claims Development [Line Items]                    
Claims incurred reported 54,550                  
IBNR $ 17,105                  
Cumulative claim counts | item 1,738                  
Claims paid $ 25,268