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Other Accounts Receivable
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Other Accounts Receivable
Other Accounts Receivable:
Other accounts receivable consist of the following at December 31, 2017 and 2016 (in thousands):
 
December 31,
 
2017
 
2016
Value added tax/consumption tax
$
23,158

 
$
15,324

Other
14,779

 
26,661

Total
$
37,937

 
$
41,985