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ACCOUNTS RECEIVABLE
6 Months Ended
Jun. 30, 2017
Accounts Receivable, Net [Abstract]  
ACCOUNTS RECEIVABLE
6.    ACCOUNTS RECEIVABLE
Accounts receivable comprised the following at June 30, 2017 and December 31, 2016:
 
June 30, 2017

 
December 31, 2016

Unrelated customers
$
197,631

 
$
187,937

Less: allowance for bad debts and credit notes
(11,173
)
 
(9,598
)
Total accounts receivable
$
186,458

 
$
178,339