REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Premiums Written
Direct	$ 166,734	$ 168,692	$ 301,129	$ 314,743
Ceded	(78,804)	(78,588)	(96,581)	(102,725)
Total premiums written	87,930	90,104	204,548	212,018
Net Premiums Earned
Direct	146,890	150,563	293,332	298,541
Ceded	(63,333)	(67,009)	(127,666)	(133,327)
Total premiums earned	$ 83,557	$ 83,554	$ 165,666	$ 165,214