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ACCOUNTS RECEIVABLE
9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
ACCOUNTS RECEIVABLE ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following as of the dates set forth below (amounts in thousands):
 
September 30,
2018
 
December 31,
2017
Accounts receivable
$
263,370

 
$
229,677

Allowance for doubtful accounts
(4,016
)
 
(2,974
)
Accounts receivable, net
$
259,354

 
$
226,703


Accounts receivable are reduced by an estimated allowance for doubtful accounts, which is based on known risks and historical losses.