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Accounts Receivable - Third Parties (Tables)
 6 Months Ended
Jun. 30, 2018
Accounts Receivable, Net [Abstract]  
Schedule Of Accounts Receivable - Third Parties
Accounts receivable—third parties consist of the following:
 
 
June 30,
2018
 
December 31,
2017
Trade customers
 
$
17,510

 
$
18,794

Allowance for doubtful accounts
 
(1,130
)
 
(711
)
Accounts receivable, net—third parties
 
$
16,380

 
$
18,083