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Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Receivables - current portion    
Accounts receivable - trade $ 12,308 $ 17,878
Refundable income tax 14,203 13,678
Refundable value added tax 53,022 50,669
Accounts receivable - other 3,396 3,767
Receivables, net current portion 82,929 85,992
Receivables - non-current portion    
Refundable value added tax 24,114 24,768
Total receivables $ 107,043 $ 110,760