SUPPLEMENTAL BALANCE SHEET INFORMATION - Deferred Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred charges
Initial franchise fees	$ 6,795	$ 6,615
Less - accumulated amortization	(2,366)	(1,906)
Deferred Costs, Net	4,429	4,709
Amortization expense	$ 500	$ 400	$ 500