CLOSURE AND POST-CLOSURE OBLIGATIONS - CHANGES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in the reported closure and post-closure asset, recorded as a component of Property and equipment, net
Net closure and post-closure asset, beginning of year	$ 26,532	$ 22,884
NRC Merger purchase price allocation adjustment		(389)
Additions or adjustments to closure and post-closure asset	732	5,422
Amortization of closure and post-closure asset	(1,614)	(1,407)
Foreign currency translation	12	22
Net closure and post-closure asset, end of year	$ 25,662	$ 26,532