REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Premiums Written
Direct	$ 180,152	$ 159,131	$ 558,492	$ 460,534
Ceded	(304,751)	(146,231)	(379,268)	(220,363)
Total premiums written	(124,599)	12,900	179,224	240,171
Net Premiums Earned
Direct	183,518	145,546	538,988	425,133
Ceded	(99,972)	(58,172)	(238,054)	(156,669)
Net premiums earned	$ 83,546	$ 87,374	$ 300,934	$ 268,464