REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Premiums written [Abstract]
Direct	$ 168,692	$ 171,218	$ 314,743	$ 307,242
Ceded	(78,983)	(119,410)	(106,287)	(162,980)
Net premiums written	89,709	51,808	208,456	144,262
Premiums earned [Abstract]
Direct	150,563	137,334	298,541	265,433
Ceded	(67,404)	(77,289)	(136,889)	(150,391)
Net premiums earned	$ 83,159	$ 60,045	$ 161,652	$ 115,042