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Income taxes (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]    
Unrecognized tax benefits, Balance at beginning of year $ 2,350 $ 2,278
Unrecognized tax benefits, Increases for tax position in prior years 300 0
Unrecognized tax benefits, Decrease for tax position in prior years 0 (60)
Unrecognized tax benefits, Interest accrual 57 132
Unrecognized tax benefits, Foreign currency revaluation (254) 0
Unrecognized tax benefits, Balance at end of year $ 2,453 $ 2,350