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ACCOUNTS RECEIVABLE
 12 Months Ended
Dec. 31, 2016
Accounts Receivable, Net [Abstract]  
ACCOUNTS RECEIVABLE
ACCOUNTS RECEIVABLE
Accounts receivable comprised the following at December 31, 2016 and December 31, 2015:
 
December 31, 2016

 
December 31, 2015

Third-party customers
$
187,937

 
$
176,628

Less: allowance for bad debts and credit notes
(9,598
)
 
(9,201
)
Total accounts receivable
$
178,339

 
$
167,427


Bad debt expense for the year ended December 31, 2016, 2015 and 2014 was US$ 3.6 million, US$ 2.1 million, and US$ 4.2 million, respectively.