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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, 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 ($)
Dec. 31, 2010
USD ($)
Homeowners                    
Incurred claims and allocated claim adjustment expense, net of reinsurance $ 1,248,333                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,212,885                  
Outstanding prior to 2010 32                  
Prior years paid 668                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 35,480                  
Homeowners | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 132,627 $ 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 25,150,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 132,602 132,602 132,602 132,599 132,604 132,523 132,246 129,790 124,326 98,190
Homeowners | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 148,067 148,079 148,370 148,414 148,755 148,860 150,791 150,334 150,141  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 29,531,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 148,067 148,069 148,014 148,026 147,451 146,908 145,852 142,846 123,046  
Homeowners | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,028 106,000 106,348 106,308 106,486 109,360 109,156 108,754    
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 $ 106,021 105,993 105,909 105,561 105,156 104,203 101,566 84,260    
Homeowners | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 101,709 101,769 102,345 102,407 103,982 107,489 105,584      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 19,221,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 101,709 101,677 101,527 100,968 99,361 96,599 76,890      
Homeowners | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 106,458 106,554 106,844 109,059 113,505 111,647        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 59                  
Cumulative number of reported claims | claim 20,084,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 106,388 106,258 106,081 105,704 103,030 83,314        
Homeowners | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 115,050 114,053 114,404 115,134 111,706          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 276                  
Cumulative number of reported claims | claim 18,714,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 114,648 113,321 111,882 109,303 90,704          
Homeowners | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 117,933 117,009 118,604 115,931            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 280                  
Cumulative number of reported claims | claim 19,853,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 117,537 115,053 113,186 95,772            
Homeowners | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 132,666 129,818 126,285              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,285                  
Cumulative number of reported claims | claim 19,827,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 129,767 128,518 106,800              
Homeowners | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 157,404 166,793                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,170                  
Cumulative number of reported claims | claim 20,954,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 152,356 130,548                
Homeowners | 2019                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 130,391                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 16,842                  
Cumulative number of reported claims | claim 16,155,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 103,790                  
Auto liability                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 1,671,607                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 1,468,500                  
Outstanding prior to 2010 73                  
Prior years paid (219)                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 203,180                  
Auto liability | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 149,481 149,542 149,425 149,818 151,653 152,483 154,222 156,369 160,058 157,712
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 48,942,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 149,474 149,439 149,364 149,247 148,751 147,337 144,255 137,012 118,345 63,416
Auto liability | 2011                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 138,849 138,949 138,891 139,840 142,488 143,133 145,735 146,713 150,803  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 94                  
Cumulative number of reported claims | claim 45,976,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 138,692 138,689 138,358 138,151 136,906 133,931 126,812 108,837 61,070  
Auto liability | 2012                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 145,515 145,620 145,847 147,594 149,346 150,336 153,815 156,448    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 204                  
Cumulative number of reported claims | claim 45,984,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 145,184 145,121 144,622 142,916 138,641 127,185 109,574 61,279    
Auto liability | 2013                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 148,135 147,993 148,111 150,657 150,720 152,858 153,860      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 575                  
Cumulative number of reported claims | claim 47,369,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 147,409 146,770 145,291 139,954 131,214 108,856 62,224      
Auto liability | 2014                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 159,355 159,794 159,937 158,470 157,249 155,105        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 665                  
Cumulative number of reported claims | claim 49,386,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 157,596 155,758 149,059 139,463 117,468 61,329        
Auto liability | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 178,654 178,325 177,021 172,553 165,517          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,850                  
Cumulative number of reported claims | claim 50,618,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 174,495 170,088 157,980 134,473 70,836          
Auto liability | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 186,568 184,567 184,440 180,380            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,649                  
Cumulative number of reported claims | claim 51,995,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 177,834 166,815 140,901 73,073            
Auto liability | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 188,625 188,756 187,983              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 8,025                  
Cumulative number of reported claims | claim 48,906,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 166,614 139,531 70,682              
Auto liability | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 195,284 200,314                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 26,931                  
Cumulative number of reported claims | claim 47,078,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 141,537 77,528                
Auto liability | 2019                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 181,141                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 64,778                  
Cumulative number of reported claims | claim 42,587,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 69,665                  
Auto physical damage                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 973,319                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 968,372                  
Outstanding prior to 2010 0                  
Prior years paid 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,947                  
Auto physical damage | 2010                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 83,011 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 $ 0                  
Cumulative number of reported claims | claim 81,581,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,009 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 85,090 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 $ 0                  
Cumulative number of reported claims | claim 80,804,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 85,090 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 83,322 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 $ 0                  
Cumulative number of reported claims | claim 78,165,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 83,322 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 88,457 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 $ 0                  
Cumulative number of reported claims | claim 80,920,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 88,452 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 95,241 95,232 95,239 95,422 95,634 95,572        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claim 87,901,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 95,243 95,258 95,256 95,266 95,444 $ 88,939        
Auto physical damage | 2015                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 97,612 97,455 97,624 97,994 99,291          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (18)                  
Cumulative number of reported claims | claim 87,497,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 97,625 97,638 97,685 97,850 $ 92,138          
Auto physical damage | 2016                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 109,603 109,348 109,515 112,430            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (17)                  
Cumulative number of reported claims | claim 93,225,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 109,611 109,536 109,686 $ 106,459            
Auto physical damage | 2017                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 110,520 111,798 115,483              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (161)                  
Cumulative number of reported claims | claim 91,270,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 110,674 110,817 $ 105,156              
Auto physical damage | 2018                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 108,886 109,040                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (326)                  
Cumulative number of reported claims | claim 94,388,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 109,103 $ 103,559                
Auto physical damage | 2019                    
Incurred claims and allocated claim adjustment expense, net of reinsurance 111,577                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ (6,829)                  
Cumulative number of reported claims | claim 89,207,000                  
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 106,243