REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Premiums Written
Direct	$ 205,378	$ 169,170	$ 378,340	$ 301,403
Ceded	(60,751)	(62,339)	(74,517)	(74,132)
Total premiums written	144,627	106,831	303,823	227,271
Net Premiums Earned
Direct	179,896	141,220	355,470	279,587
Ceded	(68,418)	(48,914)	(138,082)	(98,497)
Net premiums earned	$ 111,478	$ 92,306	$ 217,388	$ 181,090