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Loss and Loss Expense Reserves, Incurred Claims Development (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Claim
Dec. 31, 2017
USD ($)
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 ($)
Dec. 31, 2009
USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Liabilities for claims and claims adjustment expenses, net of reinsurance $ 468,954 $ 354,282                
Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 311,509                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 77,584                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 192,153                  
Outstanding liabilities prior to 2009 net of reinsurance 12,640                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 131,996 113,751                
Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 680,125                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 106,968                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 416,223                  
Outstanding liabilities prior to 2009 net of reinsurance 4,621                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 268,523 162,581                
Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 86,257                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 11,447                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 64,867                  
Outstanding liabilities prior to 2009 net of reinsurance 0                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 21,390 28,980                
Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 140,577                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,738                  
Short-duration Insurance Contract, Claims Settlement Period 2 years                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 127,258                  
Outstanding liabilities prior to 2009 net of reinsurance [1] 10                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 13,329 [1] 9,087                
Accident Year 2009 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 21,153 20,946 $ 20,817 $ 20,641 $ 20,767 $ 21,268 $ 21,261 $ 21,447 $ 20,931 $ 17,270
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 985                  
Number of reported claims per year | Claim 3,784                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 19,261 18,982 18,514 18,028 17,448 16,592 15,576 13,343 10,073 4,186
Accident Year 2009 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 25,761 25,485 25,320 25,373 25,872 27,259 26,280 30,203 30,406 29,707
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 190                  
Number of reported claims per year | Claim 899                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 25,391 25,199 25,125 25,114 25,066 24,866 23,521 19,718 17,880 928
Accident Year 2009 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0 0 0 0 0 0 0 0 0 0
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0 0 0 0 0 0 0 0 0 $ 0
Accident Year 2009 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2010 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 19,819 19,541 19,195 18,344 18,849 19,300 19,400 20,111 20,644  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,098                  
Number of reported claims per year | Claim 4,223                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 17,062 16,789 16,590 15,835 14,966 13,845 11,963 9,134 3,974  
Accident Year 2010 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,985 19,081 19,377 19,764 20,300 19,139 21,899 22,161 31,124  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 112                  
Number of reported claims per year | Claim 2,403                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 18,791 18,662 18,866 18,517 18,627 16,052 11,635 7,166 1,649  
Accident Year 2010 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 11,677 11,893 11,689 10,740 9,733 7,946 7,827 4,277 2,196  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 24                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 11,334 11,334 11,132 9,904 7,758 5,844 3,505 729 $ 41  
Accident Year 2010 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2011 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 26,631 26,617 27,293 25,515 26,767 26,958 26,628 26,057    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,179                  
Number of reported claims per year | Claim 4,546                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 22,991 22,569 21,622 20,617 18,884 15,973 11,912 4,916    
Accident Year 2011 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 37,852 36,076 37,122 35,805 36,894 31,633 43,832 46,829    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 131                  
Number of reported claims per year | Claim 2,901                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 36,400 35,561 34,009 33,255 30,795 23,615 11,350 1,809    
Accident Year 2011 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 12,725 12,744 12,735 10,779 9,859 9,017 8,314 10,492    
Total of incurred-but-not-reported liabilities plus expected development on reported claims 116                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 12,280 11,679 10,404 8,104 4,983 2,061 637 $ 50    
Accident Year 2011 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2012 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 26,775 27,020 25,616 24,485 24,887 25,544 23,965      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,824                  
Number of reported claims per year | Claim 4,481                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 21,157 20,276 18,946 17,415 14,834 11,004 4,597      
Accident Year 2012 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 51,648 51,475 48,708 51,367 49,743 54,269 49,743      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 135                  
Number of reported claims per year | Claim 3,130                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 50,750 50,036 47,601 45,303 32,942 23,252 3,086      
Accident Year 2012 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 14,949 16,555 14,605 10,157 5,569 9,276 10,041      
Total of incurred-but-not-reported liabilities plus expected development on reported claims 706                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 13,091 11,239 8,355 5,077 2,388 992 $ 103      
Accident Year 2012 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2013 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 31,131 32,553 32,121 29,913 30,638 27,619        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 3,780                  
Number of reported claims per year | Claim 5,275                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 24,968 23,643 21,655 18,065 12,792 4,880        
Accident Year 2013 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 48,857 46,690 36,371 37,701 39,143 53,817        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 663                  
Number of reported claims per year | Claim 3,749                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 46,084 44,865 34,481 25,270 15,772 5,167        
Accident Year 2013 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 22,213 23,256 17,694 11,618 13,034 14,370        
Total of incurred-but-not-reported liabilities plus expected development on reported claims 1,847                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 18,229 14,779 10,988 5,088 1,135 $ 123        
Accident Year 2013 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2014 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 31,031 33,427 34,009 36,968 36,768          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,482                  
Number of reported claims per year | Claim 5,406                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 23,968 22,387 19,075 13,665 5,328          
Accident Year 2014 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 64,372 52,964 52,483 52,254 49,971          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 307                  
Number of reported claims per year | Claim 3,320                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 57,692 45,075 28,393 9,046 4,023          
Accident Year 2014 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 12,749 9,837 7,259 8,825 12,675          
Total of incurred-but-not-reported liabilities plus expected development on reported claims 2,297                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 6,627 3,999 2,241 761 $ 723          
Accident Year 2014 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2015 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 24,948 25,889 23,115 26,277            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 5,328                  
Number of reported claims per year | Claim 6,308                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 17,487 15,020 10,128 2,918            
Accident Year 2015 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 71,088 64,323 70,174 61,420            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,785                  
Number of reported claims per year | Claim 3,185                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 63,133 49,267 27,582 10,923            
Accident Year 2015 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 10,422 7,147 7,859 11,638            
Total of incurred-but-not-reported liabilities plus expected development on reported claims 5,422                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 3,207 1,899 390 $ 10            
Accident Year 2015 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Number of reported claims per year | Claim 0                  
Accident Year 2016 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance $ 29,317 29,757 35,240              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 6,740                  
Number of reported claims per year | Claim 6,059                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 18,461 13,377 5,784              
Accident Year 2016 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 77,362 68,974 61,638              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 7,048                  
Number of reported claims per year | Claim 3,707                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 52,764 30,377 6,843              
Accident Year 2016 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,522 2,482 6,368              
Total of incurred-but-not-reported liabilities plus expected development on reported claims 1,035                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 99 5 0              
Accident Year 2016 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 39,658 39,477 40,651              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 5                  
Number of reported claims per year | Claim 9,619                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 39,073 39,354 $ 34,114              
Accident Year 2017 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 37,731 42,387                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 13,918                  
Number of reported claims per year | Claim 16,106                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 15,811 6,150                
Accident Year 2017 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 103,611 103,126                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 25,527                  
Number of reported claims per year | Claim 5,261                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 46,529 11,415                
Accident Year 2017 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0 0                
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0 0                
Accident Year 2017 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 47,193 48,440                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 512                  
Number of reported claims per year | Claim 10,517                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 46,554 $ 39,517                
Accident Year 2018 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 62,973                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 36,250                  
Number of reported claims per year | Claim 12,893                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 10,987                  
Accident Year 2018 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 179,589                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 70,070                  
Number of reported claims per year | Claim 6,870                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 18,689                  
Accident Year 2018 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0                  
Accident Year 2018 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 53,726                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,221                  
Number of reported claims per year | Claim 10,186                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 41,631                  
[1] The majority of physical damage claims settle within a two-year period. The triangles above have been abbreviated to reflect the short-tail nature of this business.