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Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Allowance for Doubtful Accounts Receivable   $ 0
Receivables - current portion    
Accounts receivable - trade $ 24,791 20,448
Refundable income tax 28,652 30,045
Refundable value added tax 54,925 63,805
Accounts receivable - other 3,791 2,623
Receivables, net current portion 112,159 116,921
Receivables - non-current portion    
Refundable value added tax 26,738 21,686
Receivables, Total $ 138,897 $ 138,607