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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, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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 ($)
Dec. 31, 2009
USD ($)
Homeowners                    
Incurred claims and allocated claim adjustment expense, net of reinsurance $ 1,235,870                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,194,897                  
Outstanding prior to 2009 66                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 41,039                  
Homeowners | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 113,168 $ 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 21,810,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 112,858 112,851 112,848 112,827 112,720 112,554 110,324 108,217 104,407 81,570
Homeowners | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 132,627 132,905 132,859 133,136 133,216 133,235 133,358 136,907 140,994  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 25,149,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 132,602 132,602 132,599 132,604 132,523 132,246 129,790 124,326 98,190  
Homeowners | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 148,079 148,370 148,414 148,755 148,860 150,791 150,334 150,141    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 29,530,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 148,069 148,014 148,026 147,451 146,908 145,852 142,846 123,046    
Homeowners | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,000 106,348 106,308 106,486 109,360 109,156 108,754      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 21,578,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 105,993 105,909 105,561 105,156 104,203 101,566 84,260      
Homeowners | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 101,769 102,345 102,407 103,982 107,489 105,584        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 88                  
Cumulative number of reported claims | claim 19,221,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 101,677 101,527 100,968 99,361 96,599 76,890        
Homeowners | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,554 106,844 109,059 113,505 111,647          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 257                  
Cumulative number of reported claims | claim 20,083,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 106,258 106,081 105,704 103,030 83,314          
Homeowners | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 114,053 114,404 115,134 111,706            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 362                  
Cumulative number of reported claims | claim 18,706,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 113,321 111,882 109,303 90,704            
Homeowners | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 117,009 118,604 115,931              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 724                  
Cumulative number of reported claims | claim 19,830,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 115,053 113,186 95,772              
Homeowners | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 129,818 126,285                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 759                  
Cumulative number of reported claims | claim 19,741,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 128,518 106,800                
Homeowners | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 166,793                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 27,697                  
Cumulative number of reported claims | claim 19,515,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 130,548                  
Auto liability                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 1,643,667                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,439,610                  
Outstanding prior to 2009 183                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 204,240                  
Auto liability | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 149,807 149,888 149,822 150,568 150,919 151,418 157,941 153,662 158,703 159,934
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (64)                  
Cumulative number of reported claims | claim 49,230,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,871 149,855 149,801 149,608 148,783 146,383 142,524 133,568 110,921 60,011
Auto liability | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 149,542 149,425 149,818 151,653 152,483 154,222 156,369 160,058 157,712  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 3                  
Cumulative number of reported claims | claim 48,942,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,439 149,364 149,247 148,751 147,337 144,255 137,012 118,345 63,416  
Auto liability | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 138,949 138,891 139,840 142,488 143,133 145,735 146,713 150,803    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 210                  
Cumulative number of reported claims | claim 45,976,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 138,689 138,358 138,151 136,906 133,931 126,812 108,837 61,070    
Auto liability | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 145,620 145,847 147,594 149,346 150,336 153,815 156,448      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 305                  
Cumulative number of reported claims | claim 45,984,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 145,121 144,622 142,916 138,641 127,185 109,574 61,279      
Auto liability | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 147,993 148,111 150,657 150,720 152,858 153,860        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 748                  
Cumulative number of reported claims | claim 47,368,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 146,770 145,291 139,954 131,214 108,856 62,224        
Auto liability | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 159,794 159,937 158,470 157,249 155,105          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,887                  
Cumulative number of reported claims | claim 49,380,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 155,758 149,059 139,463 117,468 61,329          
Auto liability | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 178,325 177,021 172,553 165,517            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,441                  
Cumulative number of reported claims | claim 50,596,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 170,088 157,980 134,473 70,836            
Auto liability | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 184,567 184,440 180,380              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 5,637                  
Cumulative number of reported claims | claim 51,934,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 166,815 140,901 73,073              
Auto liability | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 188,756 187,983                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 19,007                  
Cumulative number of reported claims | claim 48,587,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 139,531 70,682                
Auto liability | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 200,314                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 71,139                  
Cumulative number of reported claims | claim 43,522,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 77,528                  
Auto physical damage                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 944,793                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 938,656                  
Outstanding prior to 2009 0                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6,137                  
Auto physical damage | 2009                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 81,941 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 $ 81,941 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 83,018 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 $ 2                  
Cumulative number of reported claims | claim 81,581,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,015 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 85,102 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 $ 8                  
Cumulative number of reported claims | claim 80,803,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 85,095 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 83,334 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 $ 8                  
Cumulative number of reported claims | claim 78,163,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,326 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 88,525 88,455 88,627 88,672 88,856 91,448        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 54                  
Cumulative number of reported claims | claim 80,919,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 88,471 88,484 88,532 88,580 88,688 $ 85,110        
Auto physical damage | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 95,232 95,239 95,422 95,634 95,572          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (21)                  
Cumulative number of reported claims | claim 87,899,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 95,258 95,256 95,266 95,444 $ 88,939          
Auto physical damage | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 97,455 97,624 97,994 99,291            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (188)                  
Cumulative number of reported claims | claim 87,491,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 97,638 97,685 97,850 $ 92,138            
Auto physical damage | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 109,348 109,515 112,430              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (207)                  
Cumulative number of reported claims | claim 93,200,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 109,536 109,686 $ 106,459              
Auto physical damage | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 111,798 115,483                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 924                  
Cumulative number of reported claims | claim 91,160,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 110,817 $ 105,156                
Auto physical damage | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 109,040                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (6,859)                  
Cumulative number of reported claims | claim 91,070,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 103,559