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Goodwill and intangible assets - Future Amortization expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortization expense for fiscal years 2020 through 2024 and thereafter      
2021 $ 3,556    
2022 3,095    
2023 1,901    
2024 681    
2025 416    
Thereafter 1,003    
Net $ 10,652 $ 14,940 $ 19,152