LEASES - Lease Income Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Lease income	$ 2,169	$ 2,366	$ 4,354	$ 4,552
Weighted average remaining lease term in years			3 years 5 months 15 days
Terminalling services
Lessee, Lease, Description [Line Items]
Revenue from contract with a customer excluding assessed tax	30,992	22,309	$ 59,097	46,544
Terminalling services | Crude oil storage tanks
Lessee, Lease, Description [Line Items]
Revenue from contract with a customer excluding assessed tax	$ 1,200	$ 1,400	$ 2,400	$ 2,500