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Property and Casualty Unpaid Claims and Claim Expenses - Incurred and Paid Claims by Accident Year on a Net Basis (Details)
$ 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 ($)
Dec. 31, 2008
USD ($)
Homeowners                    
Incurred claims and allocated claim adjustment expense, net of reinsurance $ 1,208,374                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,178,109                  
Outstanding prior to 2008 37                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 30,302                  
Homeowners | 2008                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 139,311 $ 139,306 $ 139,348 $ 139,472 $ 139,511 $ 139,232 $ 139,743 $ 136,002 $ 136,743 $ 140,469
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 32,277,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 139,257 139,256 139,224 139,121 138,992 138,802 136,923 134,235 130,888 105,401
Homeowners | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 112,958 112,900 113,216 113,230 113,357 113,096 112,970 112,280 113,274  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 21,809,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 112,851 112,848 112,827 112,720 112,554 110,324 108,217 104,407 81,570  
Homeowners | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 132,905 132,859 133,136 133,216 133,235 133,358 136,907 140,994    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 74                  
Cumulative number of reported claims | claim 25,149,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 132,602 132,599 132,604 132,523 132,246 129,790 124,326 98,190    
Homeowners | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 148,370 148,414 148,755 148,860 150,791 150,334 150,141      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 326                  
Cumulative number of reported claims | claim 29,526,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 148,014 148,026 147,451 146,908 145,852 142,846 123,046      
Homeowners | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,348 106,308 106,486 109,360 109,156 108,754        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 433                  
Cumulative number of reported claims | claim 21,576,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 105,909 105,561 105,156 104,203 101,566 84,260        
Homeowners | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 102,345 102,407 103,982 107,489 105,584          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 718                  
Cumulative number of reported claims | claim 19,214,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 101,527 100,968 99,361 96,599 76,890          
Homeowners | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,844 109,059 113,505 111,647            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 654                  
Cumulative number of reported claims | claim 20,076,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 106,081 105,704 103,030 83,314            
Homeowners | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 114,404 115,134 111,706              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,667                  
Cumulative number of reported claims | claim 18,673,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 111,882 109,303 90,704              
Homeowners | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 118,604 115,931                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,677                  
Cumulative number of reported claims | claim 19,733,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 113,186 95,772                
Homeowners | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 126,285                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 12,834                  
Cumulative number of reported claims | claim 17,494,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 106,800                  
Auto liability                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 1,580,516                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,385,082                  
Outstanding prior to 2008 205                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 195,636                  
Auto liability | 2008                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 138,973 138,975 139,131 139,938 140,648 141,666 149,225 142,279 145,669 144,694
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 47,245,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 138,970 138,962 138,875 138,758 138,539 137,980 134,377 123,062 103,370 54,750
Auto liability | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 149,888 149,822 150,568 150,919 151,418 157,941 153,662 158,703 159,934  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (1)                  
Cumulative number of reported claims | claim 49,232,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,855 149,801 149,608 148,783 146,383 142,524 133,568 110,921 60,011  
Auto liability | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 149,425 149,818 151,653 152,483 154,222 156,369 160,058 157,712    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 14                  
Cumulative number of reported claims | claim 48,939,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,364 149,247 148,751 147,337 144,255 137,012 118,345 63,416    
Auto liability | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 138,891 139,840 142,488 143,133 145,735 146,713 150,803      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 325                  
Cumulative number of reported claims | claim 45,973,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 138,358 138,151 136,906 133,931 126,812 108,837 61,070      
Auto liability | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 145,847 147,594 149,346 150,336 153,815 156,448        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 758                  
Cumulative number of reported claims | claim 45,983,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 144,622 142,916 138,641 127,185 109,574 61,279        
Auto liability | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 148,111 150,657 150,720 152,858 153,860          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,521                  
Cumulative number of reported claims | claim 47,353,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 145,291 139,954 131,214 108,856 62,224          
Auto liability | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 159,937 158,470 157,249 155,105            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,397                  
Cumulative number of reported claims | claim 49,332,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,059 139,463 117,468 61,329            
Auto liability | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 177,021 172,553 165,517              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 7,703                  
Cumulative number of reported claims | claim 50,428,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 157,980 134,473 70,836              
Auto liability | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 184,440 180,380                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 17,107                  
Cumulative number of reported claims | claim 51,575,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 140,901 73,073                
Auto liability | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 187,983                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 67,236                  
Cumulative number of reported claims | claim 41,269,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 70,682                  
Auto physical damage                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 927,713                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 917,647                  
Outstanding prior to 2008 0                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 10,066                  
Auto physical damage | 2008                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 87,947 87,954 87,966 87,976 87,979 87,992 86,900 87,834 87,854 89,088
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 76,517,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 87,947 87,954 87,966 87,976 87,979 87,992 87,949 87,905 87,963 $ 82,412
Auto physical damage | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 81,972 81,963 81,972 81,986 82,000 82,635 83,202 83,515 84,539  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 77,449,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 81,955 81,963 81,973 81,985 82,000 82,015 82,039 82,117 $ 78,456  
Auto physical damage | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 83,028 83,036 83,050 83,052 83,046 83,103 83,420 84,112    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 81,581,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,028 83,036 83,051 83,067 83,087 83,103 83,120 $ 79,329    
Auto physical damage | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 85,108 85,116 85,143 85,120 86,023 85,507 86,205      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 80,803,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 85,108 85,116 85,127 85,148 85,181 85,254 $ 83,227      
Auto physical damage | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 83,342 83,354 83,431 83,402 82,337 83,770        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 78,162,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,342 83,347 83,355 83,372 83,418 $ 80,519        
Auto physical damage | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 88,455 88,627 88,672 88,856 91,448          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (29)                  
Cumulative number of reported claims | claim 80,916,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 88,484 88,532 88,580 88,688 $ 85,110          
Auto physical damage | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 95,239 95,422 95,634 95,572            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (17)                  
Cumulative number of reported claims | claim 87,896,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 95,256 95,266 95,444 $ 88,939            
Auto physical damage | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 97,624 97,994 99,291              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (62)                  
Cumulative number of reported claims | claim 87,472,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 97,685 97,850 $ 92,138              
Auto physical damage | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 109,515 112,430                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (211)                  
Cumulative number of reported claims | claim 93,098,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 109,686 $ 106,459                
Auto physical damage | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 115,483                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (1,520)                  
Cumulative number of reported claims | claim 84,684,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 105,156