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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Tables)
3 Months Ended
Mar. 31, 2020
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
March 31,
 
2020
 
2019
Balance, beginning of the period
$
1,466

 
$
1,143

Charges to earnings
880

 
510

Write-off of uncollectible accounts receivable
(332
)
 
(288
)
Recoveries collected
7

 
5

Balance, end of the period
$
2,021

 
$
1,370