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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Tables)
9 Months Ended
Sep. 30, 2021
Credit Loss [Abstract]  
Reconciliation of allowance for doubtful accounts
A reconciliation of the beginning and ending balances of the allowance for doubtful accounts is as follows (in thousands):
 Three Months Ended
September 30,
Nine Months Ended
September 30,
 2021202020212020
Balance, beginning of the period$1,473 $1,756 $1,402 $1,466 
Charges to earnings678 365 1,823 1,314 
Write-off of uncollectible accounts receivable(645)(483)(1,724)(1,152)
Recoveries collected— — 10 
Balance, end of the period$1,506 $1,638 $1,506 $1,638