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Loss And Loss Adjustment Expense Reserves - Incurred and Paid Claims (Details)
number_of_claims in Thousands, $ in Thousands
Dec. 31, 2021
USD ($)
number_of_claims
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                    
Net outstanding liabilities $ 2,059,835                  
Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 16,579,484                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 14,952,786                  
All outstanding liabilities before 2012, net of reinsurance (1,381)                  
Net outstanding liabilities 1,625,317                  
Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,969,336                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,685,123                  
All outstanding liabilities before 2012, net of reinsurance 1,916                  
Net outstanding liabilities 286,129                  
2012 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,441,332 $ 1,440,537 $ 1,439,660 $ 1,438,250 $ 1,436,034 $ 1,426,735 $ 1,414,878 $ 1,409,104 $ 1,408,222 $ 1,424,754
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 52                  
Cumulative Number of Reported Claims | number_of_claims 181                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,441,027 1,440,482 1,438,686 1,434,956 1,422,705 1,409,911 1,372,828 1,304,511 1,194,648 955,647
2012 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 193,040 193,002 192,790 192,905 191,804 192,057 191,548 190,376 188,010 196,063
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 98                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 192,470 192,454 192,362 191,660 190,649 190,373 188,121 182,756 175,029 $ 128,618
2013 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,468,679 1,468,747 1,468,237 1,468,294 1,464,071 1,458,421 1,447,881 1,431,058 1,448,567  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 632                  
Cumulative Number of Reported Claims | number_of_claims 185                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,467,332 1,466,356 1,464,277 1,460,352 1,447,004 1,413,999 1,340,724 1,217,906 974,445  
2013 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 187,627 187,683 187,147 188,014 187,165 186,795 188,026 188,915 191,903  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 91                  
Cumulative Number of Reported Claims | number_of_claims 23                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 187,141 186,816 186,494 186,132 185,168 183,860 180,858 174,295 $ 133,528  
2014 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,501,850 1,501,713 1,501,075 1,498,504 1,486,322 1,473,545 1,454,366 1,467,175    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 225                  
Cumulative Number of Reported Claims | number_of_claims 180                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,500,243 1,496,814 1,490,366 1,476,944 1,432,472 1,358,472 1,231,413 967,481    
2014 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 209,622 208,743 208,003 204,986 202,513 203,218 202,621 199,298    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,156                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 207,801 207,524 203,333 202,193 198,758 194,605 186,996 $ 139,615    
2015 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,653,878 1,649,170 1,645,950 1,634,435 1,610,839 1,588,443 1,551,105      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 4,412                  
Cumulative Number of Reported Claims | number_of_claims 170                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,643,443 1,634,780 1,614,188 1,560,480 1,466,368 1,336,223 1,040,253      
2015 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 240,927 239,941 238,652 236,855 233,501 234,881 234,800      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 3,894                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 236,143 235,971 234,683 230,480 224,178 213,994 $ 163,196      
2016 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,740,807 1,732,410 1,731,997 1,713,696 1,669,642 1,672,853        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 6,077                  
Cumulative Number of Reported Claims | number_of_claims 155                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,722,293 1,699,069 1,656,192 1,554,217 1,395,199 1,094,006        
2016 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 259,984 260,496 259,708 259,497 259,489 250,691        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 544                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 258,477 256,642 253,919 245,878 234,215 $ 173,537        
2017 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,748,289 1,733,425 1,741,825 1,727,277 1,703,857          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 15,917                  
Cumulative Number of Reported Claims | number_of_claims 149                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,701,298 1,648,328 1,561,850 1,399,202 1,076,079          
2017 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 289,295 289,869 288,322 295,163 309,491          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 409                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 286,531 283,311 278,341 269,254 $ 217,900          
2018 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,806,240 1,785,071 1,773,502 1,781,817            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 36,925                  
Cumulative Number of Reported Claims | number_of_claims 146                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,697,228 1,588,049 1,417,637 1,082,127            
2018 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 305,292 310,695 308,361 311,798            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 3,873                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 294,099 286,658 271,534 $ 213,038            
2019 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,959,262 1,911,268 1,916,269              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 93,030                  
Cumulative Number of Reported Claims | number_of_claims 147                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,698,121 1,494,342 1,134,859              
2019 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 361,421 366,139 359,643              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 7,765                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 340,237 324,953 $ 240,240              
2020 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,448,083 1,514,551                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 154,412                  
Cumulative Number of Reported Claims | number_of_claims 89                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,089,096 825,398                
2020 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 411,404 420,257                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 15,816                  
Cumulative Number of Reported Claims | number_of_claims 29                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 365,910 $ 271,208                
2021 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,811,064                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 471,848                  
Cumulative Number of Reported Claims | number_of_claims 97                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 992,705                  
2021 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 510,724                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 106,771                  
Cumulative Number of Reported Claims | number_of_claims 28                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 316,314