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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 ($) | Dec. 31, 2014 USD ($)
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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 |  |  |  |  |  |  |  |  |

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