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Receivables (Tables)
 6 Months Ended
Jun. 30, 2013
Receivables [Abstract]  
Receivables
Receivables consist of the following (in thousands):
 
June 30,
2013
 
December 31, 2012
Receivables - current
 
 
 
Accounts receivable - trade
$
9,664

 
$
8,701

Refundable income tax
1,807

 
9,331

Refundable value added tax
48,186

 
40,020

Accounts receivable - other
4,950

 
4,386

 
$
64,607

 
$
62,438

Receivables - non-current
 
 
 
Refundable value added tax
$
38,539

 
$
48,767