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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities    
Trade payables $ 6,063 $ 2,170
Machinery and equipment payables 2,270 3,788
Accrued expenses 8,669 7,514
Value added tax payable 208 167
Other tax payable 576 617
Withholding personal income tax 1,511 1,240
Bonus and benefit payables 5,244 6,776
Other payables 3,496 2,506
Total $ 28,037 $ 24,778