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ACCOUNTS RECEIVABLE
 12 Months Ended
Dec. 31, 2015
Accounts Receivable, Net [Abstract]  
ACCOUNTS RECEIVABLE
ACCOUNTS RECEIVABLE
Accounts receivable comprised the following at December 31, 2015 and December 31, 2014:
 
December 31, 2015

 
December 31, 2014

Unrelated customers
$
176,628

 
$
186,404

Less: allowance for bad debts and credit notes
(9,201
)
 
(10,692
)
Related parties
—

 
197

Less: allowance for bad debts and credit notes
—

 
(43
)
Total accounts receivable
$
167,427

 
$
175,866


Bad debt expense for the year ended December 31, 2015, 2014 and 2013 was US$ 2.1 million, US$ 4.2 million, and US$ 3.7 million, respectively.