ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ACCRUED EXPENSES
Salaries, wages and employee benefits	$ 8,194	$ 6,142
Federal and state tax accruals	5,114	2,649
Other	1,962	2,007
Total accrued expenses	$ 15,270	$ 10,798