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Insurance Reserves and Policyholder Funds, Liability for Unpaid Losses, Claims and Loss Adjustment Expenses (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Claim
Dec. 31, 2015
USD ($)
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 ($)
Dec. 31, 2007
USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 50,343                  
Duration required for loss data to develop the estimated ultimate incurred claims 36 months                  
Minimum [Member]                    
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Property and casualty claim threshold amount required for review $ 25,000                  
Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 439,674                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 429,927                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 9,747                  
Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 142,829                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 113,577                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 29,252                  
Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 33,084                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 31,977                  
All outstanding liabilities prior period net of reinsurance 41                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 1,148                  
General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,391                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 14,987                  
All outstanding liabilities prior period net of reinsurance 238                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 4,642                  
Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 32,101                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 28,607                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 3,494                  
Accident Year 2007 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 29,211 $ 29,111 $ 29,212 $ 29,213 $ 29,213 $ 29,214 $ 29,225 $ 29,230 $ 29,169 $ 29,616
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 526,227                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 29,211 29,211 29,212 29,213 29,213 29,214 29,255 29,230 29,169 24,324
Accident Year 2007 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,290 7,303 7,314 7,299 7,296 7,253 7,407 7,415 6,733 6,711
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,663                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,290 7,249 7,247 7,230 7,008 6,824 6,519 5,957 4,792 2,631
Accident Year 2007 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,503 4,443 4,457 4,377 4,257 3,960 4,293 4,648 5,124 6,549
IBNR Reserves $ 17                  
Cumulative number of reported claims | Claim 488                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 4,426 4,371 4,214 3,966 3,595 3,387 2,993 2,566 1,825 901
Accident Year 2007 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 769 814 818 856 868 1,084 983 893 1,953 3,287
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 37                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 769 814 816 853 849 937 698 664 519 $ 255
Accident Year 2008 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 28,682 28,683 28,683 28,687 28,688 28,712 28,721 28,698 29,344  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 528,104                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 28,682 28,683 28,683 28,687 28,688 28,712 28,721 28,698 24,055  
Accident Year 2008 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 6,105 6,104 6,106 6,112 6,124 6,374 6,627 7,011 9,723  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,534                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 6,105 6,104 6,104 6,065 5,839 5,695 5,077 4,202 2,426  
Accident Year 2008 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,647 2,548 2,507 2,489 2,479 2,685 2,858 4,359 5,386  
IBNR Reserves $ 20                  
Cumulative number of reported claims | Claim 387                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,564 2,506 2,418 2,123 2,023 1,861 1,637 1,091 534  
Accident Year 2008 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,324 2,324 2,360 2,360 2,312 2,312 2,420 2,098 3,883  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 62                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,324 2,324 2,360 2,359 2,311 2,232 2,261 1,369 $ 503  
Accident Year 2009 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 30,430 30,431 30,432 30,438 30,447 30,481 30,455 31,124    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 555,808                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 30,430 30,431 30,432 30,438 30,447 30,481 30,455 29,866    
Accident Year 2009 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,154 8,155 8,123 8,245 8,558 8,659 8,891 10,817    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,754                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 8,154 8,155 8,123 7,995 7,502 6,353 5,208 3,250    
Accident Year 2009 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,832 1,828 1,727 1,702 1,730 1,944 2,215 3,392    
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 283                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,816 1,796 1,662 1,629 1,410 1,082 941 476    
Accident Year 2009 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,664 4,916 4,636 3,616 3,951 4,239 5,025 4,920    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 83                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 4,663 3,757 3,760 3,410 3,205 2,640 1,595 $ 103    
Accident Year 2010 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 34,268 34,272 34,282 34,303 34,323 34,328 34,849      
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 620,799                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 34,268 34,272 34,282 34,303 34,323 34,328 29,127      
Accident Year 2010 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 10,202 10,185 10,068 9,937 10,547 10,818 10,752      
IBNR Reserves $ 18                  
Cumulative number of reported claims | Claim 1,946                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 10,090 10,056 9,725 9,382 8,291 6,274 3,211      
Accident Year 2010 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,423 2,400 2,258 2,337 2,269 2,699 4,114      
IBNR Reserves $ 10                  
Cumulative number of reported claims | Claim 288                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,382 2,368 2,037 1,542 1,374 678 284      
Accident Year 2010 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,563 3,549 3,607 3,396 3,618 4,624 3,995      
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 93                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 3,560 3,545 3,252 2,943 2,780 2,193 $ 928      
Accident Year 2011 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 38,302 38,316 38,327 38,360 38,296 38,188        
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 658,696                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 38,302 38,316 38,327 38,360 38,296 31,720        
Accident Year 2011 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,495 13,281 13,289 13,235 13,802 12,263        
IBNR Reserves $ 65                  
Cumulative number of reported claims | Claim 2,129                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 13,106 13,039 12,071 9,858 7,934 4,205        
Accident Year 2011 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,242 1,174 1,338 1,452 1,723 3,022        
IBNR Reserves $ 17                  
Cumulative number of reported claims | Claim 198                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,169 1,161 835 582 412 295        
Accident Year 2011 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,031 4,966 5,092 5,080 4,786 4,422        
IBNR Reserves $ 1                  
Cumulative number of reported claims | Claim 124                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,022 4,939 4,748 4,622 3,207 $ 1,031        
Accident Year 2012 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 50,989 50,998 51,021 50,996 50,021          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 860,258                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 50,989 50,998 51,021 50,996 42,267          
Accident Year 2012 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,313 13,707 14,108 15,007 12,980          
IBNR Reserves $ 19                  
Cumulative number of reported claims | Claim 2,338                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 13,197 12,932 11,507 8,791 4,627          
Accident Year 2012 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,070 5,070 5,113 5,114 5,478          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,129                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,067 5,067 5,089 5,075 4,610          
Accident Year 2012 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,214 1,270 1,269 1,305 4,055          
IBNR Reserves $ 23                  
Cumulative number of reported claims | Claim 155                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,113 1,034 847 707 371          
Accident Year 2012 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,869 5,345 5,396 4,767 4,979          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 86                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 4,869 5,331 4,856 4,581 $ 2,257          
Accident Year 2013 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 57,023 57,034 56,970 56,974            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 949,778                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 57,023 57,034 56,970 47,770            
Accident Year 2013 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 21,823 21,096 20,702 18,664            
IBNR Reserves $ 906                  
Cumulative number of reported claims | Claim 3,251                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 19,407 16,782 12,193 5,144            
Accident Year 2013 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,599 5,536 5,515 6,039            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,598                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,599 5,466 5,486 4,778            
Accident Year 2013 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 817 926 728 3,461            
IBNR Reserves $ 2                  
Cumulative number of reported claims | Claim 186                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 811 579 339 104            
Accident Year 2013 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,947 2,743 2,007 3,060            
IBNR Reserves $ 31                  
Cumulative number of reported claims | Claim 56                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,763 1,369 1,010 $ 323            
Accident Year 2014 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 56,981 56,938 57,179              
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 933,020                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 56,981 56,938 48,024              
Accident Year 2014 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 22,041 21,881 20,812              
IBNR Reserves $ 1,683                  
Cumulative number of reported claims | Claim 3,522                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 17,554 13,807 6,822              
Accident Year 2014 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,583 7,657 8,079              
IBNR Reserves $ 1                  
Cumulative number of reported claims | Claim 1,633                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,570 7,619 6,437              
Accident Year 2014 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 557 501 3,744              
IBNR Reserves $ 128                  
Cumulative number of reported claims | Claim 189                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 331 299 171              
Accident Year 2014 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,990 3,130 3,214              
IBNR Reserves $ 75                  
Cumulative number of reported claims | Claim 46                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,727 2,327 $ 1,331              
Accident Year 2015 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 54,939 55,482                
IBNR Reserves $ 62                  
Cumulative number of reported claims | Claim 890,878                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 54,876 45,430                
Accident Year 2015 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,857 18,521                
IBNR Reserves $ 2,992                  
Cumulative number of reported claims | Claim 3,431                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 11,878 6,226                
Accident Year 2015 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,955 8,287                
IBNR Reserves $ 2                  
Cumulative number of reported claims | Claim 1,583                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,937 6,745                
Accident Year 2015 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,037 4,421                
IBNR Reserves $ 467                  
Cumulative number of reported claims | Claim 136                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 259 98                
Accident Year 2015 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,630 1,902                
IBNR Reserves $ 377                  
Cumulative number of reported claims | Claim 48                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 856 $ 641                
Accident Year 2016 [Member] | Medicare Supplement [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 58,849                  
IBNR Reserves $ 9,520                  
Cumulative number of reported claims | Claim 879,603                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 49,165                  
Accident Year 2016 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 20,549                  
IBNR Reserves $ 7,421                  
Cumulative number of reported claims | Claim 3,374                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 6,796                  
Accident Year 2016 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 6,877                  
IBNR Reserves $ 196                  
Cumulative number of reported claims | Claim 1,187                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,804                  
Accident Year 2016 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,119                  
IBNR Reserves $ 2,660                  
Cumulative number of reported claims | Claim 63                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 116                  
Accident Year 2016 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,314                  
IBNR Reserves $ 1,703                  
Cumulative number of reported claims | Claim 41                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,054