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Pension benefits (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Projected benefit obligation at beginning of the year $ 2,695 $ 2,074 $ 1,392
Service cost 420 332 244
Interest cost 218 186 142
Actuarial loss 186 299 271
Foreign currency exchange rate changes 101 (100) 86
Benefits paid (68) (96) (61)
Projected benefit obligation at end of year $ 3,552 $ 2,695 $ 2,074