REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net premiums written:
Direct	$ 134,395	$ 146,051
Ceded	(20,107)	(24,137)
Total premiums written	114,288	121,914
Net premiums earned:
Direct	146,442	147,978
Ceded	(64,333)	(66,318)
Total premiums earned	$ 82,109	$ 81,660