RETROCESSION (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Ceded premiums earned	$ 1,700,000	$ 22,000,000.0	$ 3,200,000	$ 65,800,000
Net loss and loss adjustment expenses incurred	88,053,000	92,962,000	252,944,000	294,303,000
Loss and loss expenses recovered and recoverable	2,500,000	$ 13,900,000	6,200,000	$ 56,200,000
Loss and loss adjustment expenses recoverable					$ 27,531,000	$ 43,705,000
Provision for uncollectible losses recoverable	89,000		89,000		0
AM Best, A- Rating
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable	5,000,000.0		5,000,000.0		6,400,000
Unsecured | Unrated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable	15,000,000.0		15,000,000.0		21,200,000
Secured | Unrated
Ceded Credit Risk [Line Items]
Loss and loss adjustment expenses recoverable	$ 14,500,000		$ 14,500,000		$ 20,000,000.0