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Loss and Loss Adjustment Expense Reserves - Incurred and paid claims development (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
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 ($)
Dec. 31, 2007
USD ($)
incurred and paid claims development                    
All outstanding liabilities before 2007, net of reinsurance $ 221                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 445,252                  
Private Passenger Automobile                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,844,765                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 2,616,177                  
All outstanding liabilities before 2007, net of reinsurance 755                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 229,343                  
Private Passenger Automobile | 2007                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 269,785 $ 269,978 $ 270,545 $ 271,787 $ 273,637 $ 275,325 $ 278,633 $ 284,723 $ 289,704 $ 294,489
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 452                  
Cumulative Number of Reported claims | item 192,735                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 269,135 268,701 268,684 268,418 267,215 264,471 258,968 248,726 229,767 172,883
Private Passenger Automobile | 2008                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 255,248 256,574 256,806 258,705 262,316 265,634 271,319 278,148 286,394  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 546                  
Cumulative Number of Reported claims | item 186,654                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 254,585 254,558 254,436 253,410 250,785 244,427 236,531 218,935 171,445  
Private Passenger Automobile | 2009                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 252,035 252,710 253,865 256,653 260,136 262,056 266,660 270,462    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 608                  
Cumulative Number of Reported claims | item 182,449                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 250,709 250,466 249,832 246,805 241,923 232,704 216,220 170,304    
Private Passenger Automobile | 2010                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 259,531 261,089 262,580 266,574 268,620 271,021 270,882      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,595                  
Cumulative Number of Reported claims | item 183,182                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 257,184 256,527 254,256 249,852 239,275 225,179 175,356      
Private Passenger Automobile | 2011                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 285,526 286,722 289,030 291,934 294,857 294,858        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,329                  
Cumulative Number of Reported claims | item 196,629                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 280,924 278,132 272,713 260,983 247,170 202,663        
Private Passenger Automobile | 2012                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 270,406 274,058 279,249 283,101 283,638          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,441                  
Cumulative Number of Reported claims | item 176,903                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 261,016 256,655 248,468 233,570 186,234          
Private Passenger Automobile | 2013                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 293,689 296,298 297,756 297,756            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 417                  
Cumulative Number of Reported claims | item 185,929                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 275,856 265,366 250,935 199,892            
Private Passenger Automobile | 2014                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 309,208 310,726 310,726              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (7,991)                  
Cumulative Number of Reported claims | item 187,685                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 279,361 262,848 209,883              
Private Passenger Automobile | 2015                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 326,897 330,255                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (9,447)                  
Cumulative Number of Reported claims | item 196,780                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 275,015 220,466                
Private Passenger Automobile | 2016                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 322,440                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (20,475)                  
Cumulative Number of Reported claims | item 169,056                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 212,392                  
Commercial Automobile                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 404,252                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 331,604                  
All outstanding liabilities before 2007, net of reinsurance 401                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 73,049                  
Commercial Automobile | 2007                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 35,467 35,568 35,572 35,578 36,289 36,250 36,753 37,553 37,651 38,425
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 23                  
Cumulative Number of Reported claims | item 19,013                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 35,401 35,197 35,170 35,091 34,887 33,828 32,598 29,165 25,876 17,654
Commercial Automobile | 2008                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 35,486 35,724 36,212 36,404 36,854 36,511 37,017 38,309 38,389  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (47)                  
Cumulative Number of Reported claims | item 17,787                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 35,498 35,464 35,495 35,151 34,100 31,822 28,949 25,518 17,710  
Commercial Automobile | 2009                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 31,442 31,545 31,655 31,851 31,949 32,320 32,744 34,078    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 362                  
Cumulative Number of Reported claims | item 16,348                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 31,060 31,022 30,624 29,038 27,241 25,275 22,958 16,518    
Commercial Automobile | 2010                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 28,950 29,240 29,840 29,468 29,386 29,885 30,198      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (102)                  
Cumulative Number of Reported claims | item 15,085                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 28,140 27,917 27,379 25,860 23,869 21,739 15,864      
Commercial Automobile | 2011                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 33,843 34,601 35,147 35,191 35,449 35,169        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1                  
Cumulative Number of Reported claims | item 16,446                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 32,966 31,996 30,843 28,899 25,382 18,312        
Commercial Automobile | 2012                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 35,822 34,972 34,993 34,829 34,086          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 634                  
Cumulative Number of Reported claims | item 14,478                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 29,115 28,046 25,887 23,027 16,210          
Commercial Automobile | 2013                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 40,044 41,675 43,108 42,841            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,703                  
Cumulative Number of Reported claims | item 18,076                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 34,203 32,739 30,457 21,167            
Commercial Automobile | 2014                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 49,831 51,030 51,543              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,777                  
Cumulative Number of Reported claims | item 19,621                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 37,392 33,715 24,803              
Commercial Automobile | 2015                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 55,197 55,594                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (677)                  
Cumulative Number of Reported claims | item 22,606                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 40,610 28,968                
Commercial Automobile | 2016                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 58,170                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 6,844                  
Cumulative Number of Reported claims | item 18,273                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 27,219                  
Homeowners                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 635,180                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance 559,946                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 75,455                  
Homeowners | 2007                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 18,040 18,229 18,330 18,338 18,528 18,795 19,585 20,995 21,903 22,219
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 65                  
Cumulative Number of Reported claims | item 2,923                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 17,849 17,849 17,848 17,846 17,787 17,547 17,238 14,409 14,056 $ 9,386
Homeowners | 2008                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 25,567 25,750 25,842 26,264 26,319 26,951 27,854 28,702 29,643  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 184                  
Cumulative Number of Reported claims | item 4,540                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 25,279 25,260 25,245 25,200 25,089 24,954 22,808 20,661 $ 12,084  
Homeowners | 2009                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 28,888 28,982 29,049 29,700 30,925 31,870 31,661 32,120    
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 265                  
Cumulative Number of Reported claims | item 3,851                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 28,620 28,621 28,608 28,518 28,324 27,904 23,717 $ 16,682    
Homeowners | 2010                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 43,236 43,756 44,639 45,756 48,443 49,972 50,933      
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 425                  
Cumulative Number of Reported claims | item 6,902                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 42,707 42,628 42,359 42,000 41,474 38,867 $ 26,724      
Homeowners | 2011                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 99,203 100,837 102,188 105,215 105,665 101,846        
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 1,184                  
Cumulative Number of Reported claims | item 15,335                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 96,869 96,941 96,798 95,643 91,711 $ 71,767        
Homeowners | 2012                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 48,401 50,844 54,906 57,425 57,865          
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 2,016                  
Cumulative Number of Reported claims | item 6,240                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 44,811 44,468 44,268 42,744 $ 32,190          
Homeowners | 2013                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 60,042 65,059 65,967 66,066            
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 3,998                  
Cumulative Number of Reported claims | item 5,908                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 53,105 52,782 50,793 $ 39,188            
Homeowners | 2014                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 69,489 71,707 70,654              
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 5,652                  
Cumulative Number of Reported claims | item 6,339                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 57,300 53,995 $ 40,749              
Homeowners | 2015                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 164,604 165,551                
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ (13,963)                  
Cumulative Number of Reported claims | item 20,176                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 148,656 $ 112,991                
Homeowners | 2016                    
incurred and paid claims development                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 77,710                  
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development of Reported Claims $ 3,076                  
Cumulative Number of Reported claims | item 5,348                  
Cumulative paid and allocated claim adjustment expenses, net of reinsurance $ 44,750