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Loss And Loss Adjustment Expense Reserves - Incurred and Paid Claims (Details)
number_of_claims in Thousands, $ in Thousands
Dec. 31, 2023
USD ($)
number_of_claims
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Claims Development [Line Items]                    
Net outstanding liabilities $ 2,607,862                  
Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 18,319,819                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 16,310,234                  
All outstanding liabilities before 2014, net of reinsurance 10                  
Net outstanding liabilities 2,009,595                  
Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 3,862,123                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 3,500,969                  
All outstanding liabilities before 2014, net of reinsurance 1,044                  
Net outstanding liabilities 362,198                  
2014 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,502,313 $ 1,502,161 $ 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 $ 58                  
Cumulative Number of Reported Claims | number_of_claims 180                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,502,305 1,501,483 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 208,990 209,071 209,622 208,743 208,003 204,986 202,513 203,218 202,621 199,298
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 208,866 208,737 207,801 207,524 203,333 202,193 198,758 194,605 186,996 $ 139,615
2015 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,655,267 1,654,843 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 $ 336                  
Cumulative Number of Reported Claims | number_of_claims 170                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,654,069 1,651,465 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 237,994 237,872 240,927 239,941 238,652 236,855 233,501 234,881 234,800  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 150                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 237,651 236,983 236,143 235,971 234,683 230,480 224,178 213,994 $ 163,196  
2016 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,745,513 1,743,417 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 $ 2,544                  
Cumulative Number of Reported Claims | number_of_claims 155                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,740,902 1,736,697 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 259,701 259,722 259,984 260,496 259,708 259,497 259,489 250,691    
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 48                  
Cumulative Number of Reported Claims | number_of_claims 24                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 259,875 259,045 258,477 256,642 253,919 245,878 234,215 $ 173,537    
2017 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,754,356 1,755,702 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 $ 4,910                  
Cumulative Number of Reported Claims | number_of_claims 149                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,746,147 1,733,196 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 290,909 291,360 289,294 289,869 288,322 295,163 309,491      
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 227                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 290,984 290,291 286,531 283,311 278,341 269,254 $ 217,900      
2018 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,811,302 1,807,297 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 $ 12,992                  
Cumulative Number of Reported Claims | number_of_claims 147                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,784,876 1,757,923 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 308,345 306,347 305,292 310,695 308,361 311,798        
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 3,131                  
Cumulative Number of Reported Claims | number_of_claims 25                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 303,053 300,742 294,099 286,658 271,534 $ 213,038        
2019 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,951,924 1,954,151 1,959,262 1,911,268 1,916,269          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 22,464                  
Cumulative Number of Reported Claims | number_of_claims 148                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,896,186 1,828,410 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 360,140 360,609 361,421 366,139 359,643          
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 1,278                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 355,697 350,288 340,237 324,953 $ 240,240          
2020 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,430,973 1,452,343 1,448,083 1,514,551            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 36,124                  
Cumulative Number of Reported Claims | number_of_claims 91                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,328,686 1,242,000 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 411,408 413,882 411,404 420,257            
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 5,728                  
Cumulative Number of Reported Claims | number_of_claims 29                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 395,412 386,297 365,910 $ 271,208            
2021 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 1,854,319 1,879,751 1,811,064              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 96,072                  
Cumulative Number of Reported Claims | number_of_claims 104                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,599,756 1,410,748 992,705              
2021 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 504,086 511,311 510,724              
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 11,687                  
Cumulative Number of Reported Claims | number_of_claims 31                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 473,644 458,124 $ 316,314              
2022 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,264,193 2,255,032                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 238,987                  
Cumulative Number of Reported Claims | number_of_claims 116                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,743,364 1,237,725                
2022 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 562,562 578,489                
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 23,284                  
Cumulative Number of Reported Claims | number_of_claims 30                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 501,075 $ 339,242                
2023 | Property insurance product line, automobile                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 2,349,659                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 673,888                  
Cumulative Number of Reported Claims | number_of_claims 100                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,313,943                  
2023 | Property insurance product line, homeowners'                    
Claims Development [Line Items]                    
Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance 717,988                  
Total of Incurred But Not Reported Liabilities Plus Expected Development on Reported Claims $ 147,258                  
Cumulative Number of Reported Claims | number_of_claims 39                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance $ 474,712