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Property and Equipment and Intangible Assets - Estimated future amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Estimated future amortization of identifiable intangible assets    
2021 $ 835  
2022 666  
2023 654  
2024 654  
2025 654  
Thereafter 2,322  
Total 5,785  
Other noncurrent assets, net    
Estimated future amortization of identifiable intangible assets    
Goodwill $ 6,000 $ 6,000