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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 ($)	Dec. 31, 2011 USD ($)
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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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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