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Leases - Maturities of lease obligations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Leases        
Rent expense $ 1,000 $ 3,200 $ 4,400 $ 5,700
Operating leases        
2022     4,334  
2023     4,332  
2024     4,174  
2025     3,286  
2026     2,377  
Thereafter     4,373  
Total     $ 22,876