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SHAREHOLDERS EQUITY - Stock based compensation - Time Vesting Units (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					62,569
Unrecognized compensation expense	$ 0.6		$ 0.6
Time Vesting Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period (in years)			5 years
Weighted average grant date fair value			$ 12.84
Granted (in shares)			109,607
Stock-based compensation expense	0.4	$ 0.3	$ 1.0	$ 0.7
Unrecognized compensation expense	$ 3.8		$ 3.8
Unrecognized compensation expense recognition period (in years)			2 years
Time Vesting Units \| Anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Percentage			20.00%
Granted (in shares)			109,607