SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Cash paid for income taxes, net		$ 324	$ 1,206	$ 814
Cash paid for interest, net of amount capitalized		8,593	11,217	10,038
Cash paid for operating leases		6,477	6,101
Loss associated with disposal of assets		0	57	73
Amortization of deferred financing costs		829	1,072	866
Other		829	1,129	$ 939
Operating lease right-of-use assets		9,630	11,804
USDG | Marketing Service Agreement, Capital Contribution | Related party
Related Party Transaction [Line Items]
Related Party transaction, amounts of transaction	$ 3,400
Accounting Standards Update 2016-02
Related Party Transaction [Line Items]
Operating lease right-of-use assets		3,100	17,300
Accounts payable and accrued expenses
Related Party Transaction [Line Items]
Property, plant and equipment financed through Accounts payable and accrued expenses		$ (265)	$ 186