CURRENT EXPECTED CREDIT LOSSES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Allowance for doubtful accounts rollforward
Beginning balance	$ 4,815	$ 5,181
Provision (benefit) for current expected credit losses	3,848	(448)
Write-offs	(1,330)	(315)
Recoveries collected (net of expenses)	9	8
Ending balance	$ 7,342	$ 4,410