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Receivables (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Allowance for doubtful accounts $ 0 $ 0
Receivables - current portion    
Accounts receivable - trade 17,303,000 8,701,000
Refundable income tax 6,240,000 9,331,000
Refundable value added tax 49,168,000 40,020,000
Accounts receivable - other 8,363,000 4,386,000
Receivables, net current portion 81,074,000 62,438,000
Receivables - non-current portion    
Refundable value added tax $ 36,574,000 $ 48,767,000