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Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net $ 8,212          
Accident Year 2012 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net 8,735 $ 8,753 $ 8,788 $ 8,831 $ 8,903 $ 8,971
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net          
Shortduration Insurance Contracts Number Of Reported Claims 6,889          
Accident Year 2013 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net $ 9,576 9,741 9,914 9,853 $ 9,861  
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net          
Shortduration Insurance Contracts Number Of Reported Claims 7,663          
Accident Year 2014 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net $ 10,759 10,720 10,907 $ 11,691    
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net $ 374          
Shortduration Insurance Contracts Number Of Reported Claims 9,648          
Accident Year 2015 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net $ 12,460 12,459 $ 12,214      
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net $ 1,649          
Shortduration Insurance Contracts Number Of Reported Claims 10,718          
Accident Year 2016 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net $ 13,011 $ 13,297        
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net $ 1,366          
Shortduration Insurance Contracts Number Of Reported Claims 11,134          
Accident Year 2017 [Member] | Property and Casualty Insurance [Member]            
Incurred claims development [Abstract]            
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net $ 15,749          
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net $ 4,823          
Shortduration Insurance Contracts Number Of Reported Claims 11,424