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Leases - Maturities of operating lease liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Maturities of lease liabilities:    
2022 $ 4,776  
2023 4,462  
2024 4,045  
2025 3,302  
2026 2,080  
Thereafter 3,327  
Total future minimum lease payments 21,992  
Less: imputed interest (2,877)  
Total lease liabilities $ 19,115 $ 19,705