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Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Allowance for Doubtful Accounts Receivable   $ 0
Receivables - current portion    
Accounts receivable - trade $ 14,884 20,448
Refundable income tax 27,397 30,045
Refundable value added tax 47,621 63,805
Accounts receivable - other 3,697 2,623
Receivables, net current portion 93,599 116,921
Receivables - non-current portion    
Refundable value added tax 27,507 21,686
Receivables, Total $ 121,106 $ 138,607