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REVENUE RECOGNITION AND RECEIVABLES - Allowance for Credit Losses Rollforward - (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
REVENUE RECOGNITION AND RECEIVABLES    
Beginning Balance $ 12,121 $ 12,724
Current period provision for expected losses 3,303 4,452
Write-offs charged against the allowance (1,422) (5,434)
Recoveries collected 320 466
Ending Balance $ 14,322 $ 12,208