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Receivables (Tables)
 9 Months Ended
Sep. 30, 2012
Receivables [Abstract]  
Receivables
Receivables consist of the following (in thousands):
 
September 30, 2012
 
December 31,
2011
Receivables - current portion
 
 
 
Accounts receivable - trade
$
12,276

 
$
14,366

Refundable income tax
11,399

 
11,480

Refundable value added tax
42,133

 
52,968

Accounts receivable - other
5,155

 
4,683

 
$
70,963

 
$
83,497

Receivables - non-current portion
 
 
 
Refundable value added tax
$
48,614

 
$
40,314