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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details) $ in Thousands | Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) | 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 ($) | Dec. 31, 2011 USD ($)
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Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 398,409 | $ 264,556 |  |  |  |  |  |  |  |
Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 2,688,702 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 398,409 | 264,556 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 2,290,573 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2011 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 80,086 | 80,199 | $ 80,289 | $ 80,014 | $ 79,985 | $ 79,234 | $ 77,649 | $ 78,763 | $ 79,142 | $ 77,706
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 24 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 7,400 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 80,062 | 80,020 | 80,002 | 79,480 | 79,052 | 77,022 | 73,215 | 69,461 | 62,812 | $ 44,547
Short-duration Insurance Contracts, Accident Year 2012 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 90,890 | 90,879 | 91,095 | 90,817 | 86,818 | 87,571 | 87,963 | 88,629 | 87,276 |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 124 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 12,048 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 90,563 | 90,447 | 90,580 | 90,356 | 86,013 | 82,908 | 79,810 | 75,213 | $ 52,394 |
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 106,600 | 106,450 | 106,132 | 106,222 | 106,820 | 110,268 | 106,992 | 113,477 |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 171 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 8,911 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 105,927 | 105,686 | 105,201 | 104,669 | 103,441 | 99,196 | 94,969 | $ 69,615 |  |
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 156,300 | 155,956 | 156,037 | 156,868 | 155,729 | 154,167 | 155,008 |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 331 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 13,458 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 155,287 | 154,597 | 153,593 | 151,954 | 147,031 | 135,301 | $ 98,762 |  |  |
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 244,109 | 242,610 | 242,508 | 239,784 | 236,059 | 217,832 |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 750 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 20,337 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 240,086 | 237,573 | 234,018 | 227,661 | 210,261 | $ 145,180 |  |  |  |
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 297,195 | 295,611 | 293,785 | 294,271 | 304,961 |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 1,801 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 31,143 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 291,219 | 288,425 | 280,203 | 265,069 | $ 193,876 |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 371,447 | 359,018 | 345,647 | 332,339 |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 10,920 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 86,305 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 349,380 | 327,986 | 313,883 | $ 217,983 |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 402,966 | 389,841 | 360,919 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 7,681 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 48,440 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 380,504 | 352,422 | $ 247,365 |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2019 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 387,164 | 421,426 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 22,533 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 39,332 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 327,965 | $ 240,533 |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2020 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net | 551,945 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net | $ 173,404 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim | 44,465 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 269,580 |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Accident Year 2010 | Property and Casualty, Personal Insurance Product Line |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 280 |  |  |  |  |  |  |  |  |

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