ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of the period	$ 1,473	$ 1,756	$ 1,402	$ 1,466
Charges to earnings	678	365	1,823	1,314
Write-off of uncollectible accounts receivable	(645)	(483)	(1,724)	(1,152)
Recoveries collected	0	0	5	10
Balance, end of the period	$ 1,506	$ 1,638	$ 1,506	$ 1,638