REINSURANCE (Premiums Written and Earned) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Premiums Written
Direct	$ 139,022	$ 154,782	$ 440,151	$ 469,525
Ceded	(81,023)	(146,522)	(177,604)	(249,248)
Total premiums written	57,999	8,260	262,547	220,277
Net Premiums Earned
Direct	144,907	152,779	438,239	451,320
Ceded	(46,414)	(72,015)	(174,080)	(205,342)
Total premiums earned	$ 98,493	$ 80,764	$ 264,159	$ 245,978