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Unpaid Losses and Settlement Expenses (Summary of Cumulative Paid Losses and Settlement Expenses) (Details)
claim in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
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 ($)
Dec. 31, 2008
USD ($)
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance $ 212,010                  
Cumulative paid loss and settlement expenses, net of reinsurance 171,069                  
Unpaid loss and settlement expense, net of reinsurance 41,044                  
Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 75,098                  
Cumulative paid loss and settlement expenses, net of reinsurance 70,295                  
Unpaid loss and settlement expense, net of reinsurance 4,802                  
Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 136,912                  
Cumulative paid loss and settlement expenses, net of reinsurance 100,774                  
Unpaid loss and settlement expense, net of reinsurance 36,242                  
2008 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 21,134 $ 21,098 $ 20,988 $ 20,953 $ 21,061 $ 21,070 $ 21,022 $ 21,319 $ 21,385 $ 22,464
Total IBNR plus expected development on reported claims $ 24                  
Cumulative number of reported claims | claim 2,238                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 21,063 21,005 20,799 20,266 19,396 18,428 16,323 13,352 10,500 5,790
2008 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance $ 6,773 6,774 6,805 6,792 6,837 6,901 6,484 6,703 6,892 6,980
Cumulative number of reported claims | claim 706                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,773 6,773 6,773 6,775 6,774 6,715 6,584 6,538 6,668 4,308
2008 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 14,361 14,324 14,183 14,161 14,224 14,169 14,538 14,616 14,493 15,484
Total IBNR plus expected development on reported claims $ 24                  
Cumulative number of reported claims | claim 1,532                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,290 14,232 14,026 13,491 12,622 11,713 9,739 6,814 3,832 $ 1,482
2009 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 16,290 16,265 16,176 16,507 16,681 16,213 15,438 14,944 16,505  
Total IBNR plus expected development on reported claims $ 17                  
Cumulative number of reported claims | claim 1,738                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,201 15,977 15,770 15,429 14,561 12,426 10,257 6,944 4,193  
2009 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance $ 4,339 4,370 4,352 4,409 4,562 4,406 3,889 4,099 4,560  
Cumulative number of reported claims | claim 479                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 4,339 4,338 4,338 4,349 4,280 4,137 4,082 3,930 2,991  
2009 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 11,951 11,895 11,824 12,098 12,119 11,807 11,549 10,845 11,945  
Total IBNR plus expected development on reported claims $ 17                  
Cumulative number of reported claims | claim 1,259                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,862 11,639 11,432 11,080 10,281 8,289 6,175 3,014 $ 1,202  
2010 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 16,330 16,313 16,480 16,819 16,363 15,514 16,144 16,119    
Total IBNR plus expected development on reported claims $ 73                  
Cumulative number of reported claims | claim 1,578                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,068 15,940 15,551 14,813 13,202 10,584 7,979 4,414    
2010 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 4,899 4,891 5,006 5,118 4,992 4,831 5,105 5,644    
Total IBNR plus expected development on reported claims $ 13                  
Cumulative number of reported claims | claim 485                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 4,874 4,873 4,818 4,791 4,740 4,719 4,584 3,166    
2010 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 11,431 11,422 11,474 11,701 11,371 10,683 11,039 10,475    
Total IBNR plus expected development on reported claims $ 60                  
Cumulative number of reported claims | claim 1,093                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,194 11,067 10,733 10,022 8,462 5,865 3,395 $ 1,248    
2011 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 18,450 18,672 18,831 18,791 18,515 18,834 19,802      
Total IBNR plus expected development on reported claims $ 74                  
Cumulative number of reported claims | claim 2,011                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 18,107 17,560 16,678 14,592 12,300 10,112 6,996      
2011 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 6,631 6,645 6,733 6,752 6,621 6,708 7,427      
Total IBNR plus expected development on reported claims $ 1                  
Cumulative number of reported claims | claim 655                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,623 6,589 6,556 6,520 6,459 6,351 5,327      
2011 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 11,819 12,027 12,098 12,039 11,894 12,126 12,375      
Total IBNR plus expected development on reported claims $ 73                  
Cumulative number of reported claims | claim 1,356                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,484 10,971 10,122 8,072 5,841 3,761 $ 1,669      
2012 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 19,256 19,174 18,184 17,813 17,712 19,265        
Total IBNR plus expected development on reported claims $ 217                  
Cumulative number of reported claims | claim 1,832                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 18,225 17,239 14,689 11,958 9,422 6,129        
2012 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 6,411 6,482 6,546 6,406 6,374 6,143        
Total IBNR plus expected development on reported claims $ (12)                  
Cumulative number of reported claims | claim 507                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,472 6,326 6,362 6,369 6,401 4,949        
2012 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 12,845 12,692 11,638 11,407 11,338 13,122        
Total IBNR plus expected development on reported claims $ 229                  
Cumulative number of reported claims | claim 1,325                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,753 10,913 8,327 5,589 3,021 $ 1,180        
2013 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 22,167 21,375 21,459 21,861 21,850          
Total IBNR plus expected development on reported claims $ 627                  
Cumulative number of reported claims | claim 1,796                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 20,446 18,661 15,834 12,235 8,435          
2013 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 8,471 8,415 8,290 8,302 9,266          
Total IBNR plus expected development on reported claims $ 161                  
Cumulative number of reported claims | claim 482                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,265 8,238 8,200 8,079 6,856          
2013 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 13,696 12,960 13,169 13,559 12,584          
Total IBNR plus expected development on reported claims $ 466                  
Cumulative number of reported claims | claim 1,314                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,181 10,423 7,634 4,156 $ 1,579          
2014 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 24,601 23,139 22,330 22,250            
Total IBNR plus expected development on reported claims $ 962                  
Cumulative number of reported claims | claim 1,972                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 21,398 17,261 11,718 7,782            
2014 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 7,883 7,798 7,586 8,865            
Total IBNR plus expected development on reported claims $ 48                  
Cumulative number of reported claims | claim 561                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,796 7,746 7,631 6,243            
2014 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 16,718 15,341 14,744 13,385            
Total IBNR plus expected development on reported claims $ 914                  
Cumulative number of reported claims | claim 1,411                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,602 9,515 4,087 $ 1,539            
2015 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 21,157 21,370 24,289              
Total IBNR plus expected development on reported claims $ 3,135                  
Cumulative number of reported claims | claim 1,663                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,874 11,359 6,462              
2015 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 7,717 7,494 7,693              
Total IBNR plus expected development on reported claims $ (9)                  
Cumulative number of reported claims | claim 427                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,474 7,040 5,057              
2015 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 13,440 13,876 16,596              
Total IBNR plus expected development on reported claims $ 3,144                  
Cumulative number of reported claims | claim 1,236                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,400 4,319 $ 1,405              
2016 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 22,824 25,618                
Total IBNR plus expected development on reported claims $ 4,975                  
Cumulative number of reported claims | claim 1,592                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,109 7,647                
2016 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 7,981 8,941                
Total IBNR plus expected development on reported claims $ (249)                  
Cumulative number of reported claims | claim 445                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,624 6,157                
2016 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 14,843 16,677                
Total IBNR plus expected development on reported claims $ 5,224                  
Cumulative number of reported claims | claim 1,147                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 5,485 $ 1,490                
2017 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 29,801                  
Total IBNR plus expected development on reported claims $ 10,943                  
Cumulative number of reported claims | claim 1,531                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,578                  
2017 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 13,993                  
Total IBNR plus expected development on reported claims $ 204                  
Cumulative number of reported claims | claim 515                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 10,055                  
2017 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 15,808                  
Total IBNR plus expected development on reported claims $ 10,739                  
Cumulative number of reported claims | claim 1,016                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 1,523                  
Years 2008 Through 2017 [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 40,941                  
Years 2008 Through 2017 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 4,803                  
Years 2008 Through 2017 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 36,138                  
Prior To 2008 [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 103                  
Prior To 2008 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense (1)                  
Prior To 2008 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense $ 104