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Related parties (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related parties      
Sales $ 479 $ 3,081 $ 4,043
Purchases   4,911 11,901
Accounts payable 115 334 1,481
Accounts receivable $ 106 $ 676 $ 563