SEGMENT REPORTING Geographic information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Gross premiums written	$ 98,470	$ 110,607	$ 152,340	$ 162,560	$ 135,143	$ 115,154	$ 142,109	$ 175,125	$ 523,977	$ 567,531	$ 692,651
Gross premiums by geographical area as a percentage of total gross premiums									100.00%	100.00%	100.00%
U.S. and Caribbean
Revenue from External Customer [Line Items]
Gross premiums written									$ 435,458	$ 507,705	$ 606,510
Gross premiums by geographical area as a percentage of total gross premiums									83.10%	89.50%	87.60%
Worldwide
Revenue from External Customer [Line Items]
Gross premiums written									$ 84,728	$ 59,366	$ 86,714
Gross premiums by geographical area as a percentage of total gross premiums									16.20%	10.50%	12.50%
Europe
Revenue from External Customer [Line Items]
Gross premiums written									$ (13)	$ 506	$ (612)
Gross premiums by geographical area as a percentage of total gross premiums									0.00%	0.00%	(0.10%)
Asia
Revenue from External Customer [Line Items]
Gross premiums written									$ 3,804	$ (46)	$ 39
Gross premiums by geographical area as a percentage of total gross premiums									0.70%	0.00%	0.00%