CREDIT FACILITY - Interest expense and unused line of credit fees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CREDIT FACILITY
Interest expense	$ 1,145		$ 3,243
Amortization of debt issuance costs	131		263
Unused line of credit fees and other	38	$ 58	77	$ 114
Total interest expense	$ 1,314	$ 58	$ 3,583	$ 114