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REVENUE RECOGNITION AND RECEIVABLES - Allowance for Credit Losses Rollforward - (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
REVENUE RECOGNITION AND RECEIVABLES    
Beginning Balance $ 12,121 $ 12,724
Current period provision for expected losses 2,299 3,397
Write-offs charged against the allowance (1,196) (4,875)
Recoveries collected 267 354
Ending Balance $ 13,491 $ 11,600