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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Additional term of contract     100 years    
Supplemental Statements of Operations Information          
Operating lease costs $ 1,428 $ 1,761 $ 3,046 $ 3,517  
Short-term lease costs 0 9 1 19  
Variable lease costs 88 105 203 234  
Total lease costs 1,516 $ 1,875 3,250 3,770  
Operating cash outflows from operating leases     3,137 3,527  
ROU assets written off due to dispositions and lease modifications     (229) $ (1,748)  
Operating Lease Liabilities          
2021 (remaining six months) 2,989   2,989    
2022 5,986   5,986    
2023 5,296   5,296    
2024 5,203   5,203    
2025 4,902   4,902    
Thereafter 25,071   25,071    
Total future minimum operating lease payments 49,447   49,447    
Less: imputed interest (13,507)   (13,507)    
Operating lease liabilities 35,940   35,940   $ 38,599
ROU asset $ 31,416   $ 31,416   $ 34,006
Weighted average remaining lease term 12 years 8 months 12 days   12 years 8 months 12 days   12 years 8 months 12 days
Weighted average discount rate 4.40%   4.40%   4.39%
Minimum          
Lessee, Lease, Description [Line Items]          
Term of contract 1 year   1 year    
Maximum          
Lessee, Lease, Description [Line Items]          
Term of contract 50 years   50 years