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Marketable securities (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Proceeds from sales $ 18,246 $ 26,382 $ 83,128
Purchase of securities 3,567 25,015 73,632
Gross gains 6 41 74
Credit Agricole securities [Member]
     
Proceeds from sales 15,143 5,775  
Purchase of securities 3,573 8,062  
Gross gains 3 10  
HSBC securities [Member]
     
Proceeds from sales 3,216 20,607  
Purchase of securities 0 16,953  
Gross gains $ 3 $ 31