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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 ($) | Dec. 31, 2012 USD ($)
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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 |  |  |  |  |  |  |  |  |

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