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ACCOUNTS RECEIVABLE
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
ACCOUNTS RECEIVABLE ACCOUNTS RECEIVABLE

Accounts receivable at December 31, 2017 and 2016, consisted of the following (amounts in thousands):
 
2017
 
2016
Accounts receivable
$
229,677

 
$
182,728

Allowance for doubtful accounts
(2,974
)
 
(3,344
)
Accounts receivable, net
$
226,703

 
$
179,384



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