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Commitments and Contingencies - Operating and Finance Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies    
Operating lease, weighted average discount rate 5.40%  
Finance lease, weighted average discount rate 4.20%  
Operating lease, weighted average remaining lease term 10 years 10 months 24 days  
Finance lease, weighted average remaining lease term 98 years  
Operating lease    
2021 $ 2,550  
2022 2,266  
2023 1,202  
2024 1,263  
2025 1,327  
Thereafter 6,259  
Total future minimum lease payments 14,867  
Imputed interest (4,115)  
Total 10,752 $ 28,476
Finance lease    
2021 1,020  
2022 1,040  
2023 1,061  
2024 1,082  
2025 1,104  
Thereafter 298,822  
Finance Lease, Liability, Payment, Due, Total 304,129  
Imputed interest (263,908)  
Total 40,221  
Fixed operating and finance lease costs 2,900 2,300
Variable operating lease costs $ 1,600 $ 1,300