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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
claim
Dec. 31, 2018
USD ($)
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                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 264,556 $ 171,884                
Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 2,208,927                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 264,556 171,884                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,944,373                  
Short-duration Insurance Contracts, Accident Year 2010 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 66,937 66,980 $ 67,020 $ 66,858 $ 67,106 $ 66,996 $ 68,854 $ 67,969 $ 67,937 $ 73,189
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 6,769                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 66,684 66,668 66,619 66,348 64,940 64,366 63,404 59,208 55,187 $ 39,307
Short-duration Insurance Contracts, Accident Year 2011 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 80,199 80,289 80,014 79,985 79,234 77,649 78,763 79,142 77,706  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 43                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 8,154                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 80,020 80,002 79,480 79,052 77,022 73,215 69,461 62,812 $ 44,547  
Short-duration Insurance Contracts, Accident Year 2012 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 90,879 91,095 90,817 86,818 87,571 87,963 88,629 87,276    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 101                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 12,852                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 90,447 90,580 90,356 86,013 82,908 79,810 75,213 $ 52,394    
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 106,450 106,132 106,222 106,820 110,268 106,992 113,477      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 255                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 9,631                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 105,686 105,201 104,669 103,441 99,196 94,969 $ 69,615      
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 155,956 156,037 156,868 155,729 154,167 155,008        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 461                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 14,123                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 154,597 153,593 151,954 147,031 135,301 $ 98,762        
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 242,610 242,508 239,784 236,059 217,832          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,168                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 21,078                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 237,573 234,018 227,661 210,261 $ 145,180          
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 295,611 293,785 294,271 304,961            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3,749                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 32,005                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 288,425 280,203 265,069 $ 193,876            
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 359,018 345,647 332,339              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 16,039                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 83,969                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 327,986 313,883 $ 217,983              
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 389,841 360,919                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 15,465                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 47,757                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 352,422 $ 247,365                
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 421,426                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 103,909                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 33,368                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 240,533                  
Short-duration Insurance Contracts, Accident Year 2008 | Property and Casualty, Personal Insurance Product Line                    
Claims Development                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 2