LOSS AND LOSS ADJUSTMENT RESERVES (Activity in Liability for Loss and LAE Reserves) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Liability for Future Policy Benefits [Abstract]
Gross reserves, beginning of period	$ 230,515	$ 158,110
Less: reinsurance recoverable	(98,345)	(40,412)
Net reserves, beginning of period	132,170	117,698
Incurred loss, net of reinsurance, related to:
Current year	48,459	60,277
Prior year loss development	(653)	2,905
Ceded losses subject to offsetting experience account adjustments	(1,735)	(6,283)
Prior years	(2,388)	(3,378)
Total incurred loss and LAE, net of reinsurance	46,071	56,899
Paid loss, net of reinsurance, related to:
Current year	22,543	18,416
Prior years	30,911	36,316
Total paid loss and LAE, net of reinsurance	53,454	54,732
Net reserves, end of period	124,787	119,865
Plus: reinsurance recoverable	(111,427)	(34,472)
Gross reserves, end of period	$ 236,214	$ 154,337