LOSS AND LOSS ADJUSTMENT RESERVES (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended
	Jul. 01, 2017	Jul. 31, 2016	Jun. 30, 2021	Jun. 30, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]
Claim and claim adjustment expenses incurred related to current year			$ (124,303)	$ (192,109)
Reinsurance Programs | Florida
Liability for Future Policy Benefit, by Product Segment [Line Items]
Claim and claim adjustment expenses incurred related to current year			$ (1,200)	$ (7,300)
Quota Share Treaties | Florida | Property Insurance Product Line
Liability for Future Policy Benefit, by Product Segment [Line Items]
Percentage of property quota share reinsurance treaty	10.00%	30.00%