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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Premiums written:
Direct	$ 807,367	$ 753,363	$ 1,573,761	$ 1,467,597
Assumed	5,333	6,536	11,888	12,807
Ceded	(111,303)	(104,651)	(211,305)	(200,596)
Net	701,397	655,248	1,374,344	1,279,808
Premiums earned:
Direct	740,348	696,723	1,468,385	1,380,456
Assumed	5,742	6,612	12,304	12,736
Ceded	(103,471)	(98,499)	(205,497)	(196,528)
Net	642,619	604,836	1,275,192	1,196,664
Loss and loss expenses incurred:
Direct	435,700	391,014	860,357	811,930
Assumed	4,348	2,364	9,613	10,368
Ceded	(59,064)	(27,050)	(102,407)	(71,029)
Net	380,984	$ 366,328	$ 767,563	$ 751,269
Fire [Member]
Loss and loss expenses incurred:
Ceded	$ (17,400)

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