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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Direct Amount	$ 3,472,715	$ 3,108,687	$ 2,993,157
Assumed From Other Companies	21,550	25,010	24,399
Ceded to Other Companies	477,012	451,883	420,385
Net premiums earned	$ 3,017,253	$ 2,681,814	$ 2,597,171
Percentage of Amount Assumed to Net	1.00%	1.00%	1.00%
Accident and Health Insurance Segment [Member]
Direct Amount	$ 2	$ 13	$ 17
Assumed From Other Companies	0	0	0
Ceded to Other Companies	2	13	17
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	$ 3,472,713	$ 3,108,674	$ 2,993,140
Assumed From Other Companies	21,550	25,010	24,399
Ceded to Other Companies	477,010	451,870	420,368
Net premiums earned	$ 3,017,253	$ 2,681,814	$ 2,597,171
Percentage of Amount Assumed to Net	1.00%	1.00%	1.00%

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