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Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Premiums written:
Direct	$ 785,680	$ 752,834	$ 2,359,441	$ 2,220,431
Assumed	6,882	7,084	18,770	19,891
Ceded	(115,634)	(108,250)	(326,939)	(308,846)
Net	676,928	651,668	2,051,272	1,931,476
Premiums earned:
Direct	752,872	706,497	2,221,257	2,086,953
Assumed	6,356	6,484	18,660	19,220
Ceded	(105,608)	(98,704)	(311,105)	(295,232)
Net	653,620	614,277	1,928,812	1,810,941
Loss and loss expenses incurred:
Direct	437,618	477,427	1,297,975	1,289,357
Assumed	4,362	6,529	13,975	16,897
Ceded	(43,305)	(104,757)	(145,712)	(175,786)
Net	$ 398,675	$ 379,199	1,166,238	$ 1,130,468
Fire [Member]
Loss and loss expenses incurred:
Ceded			$ (17,400)

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