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Pension benefits (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of the year $ 3,552 $ 2,695 $ 2,074
Service cost 517 420 332
Interest cost 238 218 186
Actuarial loss 115 186 299
Curtailments (328) 0 0
Foreign currency exchange rate changes (359) 101 (100)
Benefits paid (83) (68) (96)
Projected benefit obligation at end of year $ 3,652 $ 3,552 $ 2,695