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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 2,894  
2022 1,285  
2023 983  
2024 900  
2025 635  
Thereafter 1,243  
Total $ 7,940 $ 11,029