REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Premiums Written
Direct	$ 169,170	$ 166,734	$ 301,403	$ 301,129
Ceded	(62,339)	(78,804)	(74,132)	(96,581)
Total premiums written	106,831	87,930	227,271	204,548
Net Premiums Earned
Direct	141,220	146,890	279,587	293,332
Ceded	(48,914)	(63,333)	(98,497)	(127,666)
Total premiums earned	$ 92,306	$ 83,557	$ 181,090	$ 165,666