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Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lessee, Lease, Description [Line Items]          
Additional term of contract     100 years    
Supplemental Statements of Operations Information          
Operating lease costs $ 1,761 $ 1,705 $ 5,278 $ 5,121  
Short-term lease costs 10 9 29 29  
Variable lease costs 146 80 380 336  
Total lease costs 1,917 1,794 5,687 5,486  
Operating cash outflows from operating leases   5,226 5,286    
ROU assets obtained in exchange for operating lease liabilities   $ 44,354 1,140    
ROU assets written off due to lease modifications     (1,748) $ 0  
Operating Lease Liabilities          
2020 (remaining three months) 1,762   1,762    
2021 6,257   6,257    
2022 6,028   6,028    
2023 5,339   5,339    
2024 5,246   5,246    
Thereafter 30,073   30,073    
Total future minimum operating lease payments 54,705   54,705    
Less: imputed interest (14,785)   (14,785)    
Operating lease liabilities 39,920   39,920   $ 44,707
ROU asset $ 35,318   $ 35,318   $ 39,860
Weighted average remaining lease term 12 years 8 months 12 days   12 years 8 months 12 days   10 years 10 months 24 days
Weighted average discount rate 4.39%   4.39%   4.30%
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