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Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums Written:
Direct premiums written	$ 4,068,518	$ 3,656,537	$ 3,204,512
Assumed	32,320	22,664	24,288
Ceded premiums written	(527,248)	(489,488)	(455,708)
Net	3,573,590	3,189,713	2,773,092
Direct premiums written	4,068,518	3,656,537	3,204,512
Premiums Earned:
Direct	3,880,522	3,472,715	3,108,687
Assumed	30,742	21,550	25,010
Ceded premiums earned	(537,884)	(477,012)	(451,883)
Total net premiums earned	3,373,380	3,017,253	2,681,814
Loss and loss expense incurred:
Direct	2,537,638	2,096,512	1,822,034
Assumed	23,160	13,813	17,201
Ceded loss and loss expense	(449,020)	(296,341)	(203,412)
Net	$ 2,111,778	$ 1,813,984	$ 1,635,823

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