LOSS AND LOSS ADJUSTMENT EXPENSE (“LAE”) RESERVES (Activity in Liability for Loss and LAE Reserves) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
LOSS AND LOSS ADJUSTMENT EXPENSE (“LAE”) RESERVES [Abstract]
Gross reserves, beginning of period		$ 158,476	$ 97,340
Less: reinsurance recoverable	[1]	(41,079)	(7,496)
Net reserves, beginning of period		117,397	89,844
Incurred loss, net of reinsurance, related to:
Current year		178,299	115,270
Prior years		3,358	10,946
Total incurred loss and LAE, net of reinsurance		181,657	126,216
Paid loss, net of reinsurance, related to:
Current year		106,233	46,073
Prior years		57,322	53,526
Total paid loss and LAE, net of reinsurance		163,555	99,599
Net reserves, end of period		135,499	110,428
Plus: reinsurance recoverable	[1]	326,042	17,057
Gross reserves, end of period		$ 461,541	$ 127,485

[1] Reinsurance recoverable in this table includes only ceded loss and LAE reserves.