REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Premiums written [Abstract]
Direct	$ 154,782	$ 161,137	$ 469,525	$ 468,379
Ceded	(148,623)	(96,327)	(254,911)	(259,307)
Net premiums written	6,159	64,810	214,614	209,072
Premiums earned [Abstract]
Direct	152,779	147,624	451,320	413,056
Ceded	(74,116)	(78,219)	(211,005)	(228,609)
Net premiums earned	$ 78,663	$ 69,405	$ 240,315	$ 184,447