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ACCOUNTS RECEIVABLE AND RELATED ALLOWANCE FOR DOUBTFUL ACCOUNTS AND SALES RESERVES (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of accounts receivable balances and reserve for doubtful amount
The accounts receivable balances, and the allowance for doubtful accounts and sales reserves, are presented in the following table:
Net Accounts Receivable
December 31,
20192018
(amounts in thousands)
Accounts receivable
$396,427  $359,456  
Allowance for doubtful accounts and sales reserve
(17,515) (16,690) 
Accounts receivable, net of allowance for doubtful accounts and sales reserves
$378,912  $342,766  
Schedule of changes in allowance for doubtful accounts
The following table presents the changes in the allowance for doubtful accounts:
Changes In Allowance For Doubtful Accounts
Year Ended
Balance At
Beginning
Of Year
Additions
Charged To
Costs And
Expenses
Deductions
From
Reserves
Balance At
End Of
Year
(amounts in thousands)
December 31, 2019$9,419  $4,549  $(5,703) $8,265  
December 31, 20183,885  8,909  (3,375) 9,419  
December 31, 20172,137  3,715  (1,967) 3,885  
Schedule of Changes in Allowance for Sales Reserves
The following table presents the changes in the sales reserves:
Changes in Allowance for Sales Reserves
Year Ended
Balance At
Beginning
Of Year
Additions
Charged To
Revenues
Deductions
From
Reserves
Balance At
End Of
Year
(amounts in thousands)
December 31, 2019$7,271  $11,394  $(9,415) $9,250  
December 31, 2018$390  $14,254  $(7,373) $7,271  
December 31, 2017$—  $390  $—  $390