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Goodwill and intangible assets - Future Amortization expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortization expense for fiscal years 2019 through 2023 and thereafter      
2019 $ 4,435    
2020 4,221    
2021 3,494    
2022 3,030    
2023 1,863    
Thereafter 2,109    
Net $ 19,152 $ 10,263 $ 13,783