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Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Receivables - current portion    
Accounts receivable - trade $ 13,291 $ 10,669
Refundable income tax 5,957 1,038
Refundable value added tax 49,135 46,083
Accounts receivable - other 1,273 2,641
Receivables, net current portion 69,656 60,431
Receivables - non-current portion    
Refundable value added tax 15,140 19,293
Income Taxes Receivable, Noncurrent 0 11,658
Accounts Receivable, Net, Noncurrent 15,140 30,951
Total receivables $ 84,796 $ 91,382