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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Direct Amount	$ 4,386,556	$ 3,880,522	$ 3,472,715
Assumed From Other Companies	25,027	30,742	21,550
Ceded to Other Companies	583,977	537,884	477,012
Net premiums earned	$ 3,827,606	$ 3,373,380	$ 3,017,253
Percentage of Amount Assumed to Net	1.00%	1.00%	1.00%
Accident and Health Insurance Segment [Member]
Direct Amount	$ 0	$ 0	$ 2
Assumed From Other Companies	0	0	0
Ceded to Other Companies	0	0	2
Net premiums earned	$ 0	$ 0	$ 0
Percentage of Amount Assumed to Net	0.00%	0.00%	0.00%
Property and liability insurance [Member]
Direct Amount	$ 4,386,556	$ 3,880,522	$ 3,472,713
Assumed From Other Companies	25,027	30,742	21,550
Ceded to Other Companies	583,977	537,884	477,010
Net premiums earned	$ 3,827,606	$ 3,373,380	$ 3,017,253
Percentage of Amount Assumed to Net	1.00%	1.00%	1.00%

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