LOSS AND LOSS ADJUSTMENT RESERVES (Activity in Liability for Loss and LAE Reserves) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Liability for Future Policy Benefit, before Reinsurance [Abstract]
Gross reserves, beginning-of-period	$ 296,230	$ 230,515
Less: reinsurance recoverable	(166,396)	(98,345)
Net reserves, beginning-of-period	129,834	132,170
Incurred loss, net of reinsurance, related to:
Current year	132,087	98,132
Prior year loss development	1,524	(1,192)
Ceded losses subject to offsetting experience account adjustments	(1,432)	(3,299)
Prior years	92	(4,491)
Total incurred loss and LAE, net of reinsurance	132,179	93,641
Paid loss, net of reinsurance, related to:
Current year	69,248	42,260
Prior years	64,830	57,569
Total paid loss and LAE, net of reinsurance	134,078	99,829
Net reserves, end-of-period	127,935	125,982
Plus: reinsurance recoverable	140,800	165,693
Gross reserves, end-of-period	$ 268,735	$ 291,675