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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Premiums written:
Direct	$ 834,643	$ 807,367	$ 1,581,074	$ 1,573,761
Assumed	6,410	5,333	12,453	11,888
Ceded	(116,301)	(111,303)	(221,448)	(211,305)
Net	724,752	701,397	1,372,079	1,374,344
Premiums earned:
Direct	733,647	740,348	1,488,538	1,468,385
Assumed	6,055	5,742	12,228	12,304
Ceded	(109,031)	(103,471)	(218,392)	(205,497)
Net	630,671	642,619	1,282,374	1,275,192
Loss and loss expenses incurred:
Direct	451,013	435,700	876,808	860,357
Assumed	4,300	4,348	9,198	9,613
Ceded	(51,364)	(59,064)	(81,733)	(102,407)
Net	$ 403,949	$ 380,984	$ 804,273	$ 767,563

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