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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Allowance for doubtful accounts   $ 0
Receivables - current portion    
Accounts receivable - trade 10,679 17,303
Refundable income tax 7,856 6,240
Refundable value added tax 51,540 49,168
Accounts receivable - other 5,731 8,363
Receivables, net current portion 75,806 81,074
Receivables - non-current portion    
Refundable value added tax $ 36,271 $ 36,574