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ACCOUNTS RECEIVABLE
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
ACCOUNTS RECEIVABLE ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following as of the dates set forth below (amounts in thousands):
 
June 30,
2018
 
December 31,
2017
Accounts receivable
$
285,712

 
$
229,677

Allowance for doubtful accounts
(3,312
)
 
(2,974
)
Accounts receivable, net
$
282,400

 
$
226,703


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