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Leases - Minimum future obligations (Details) - USD ($)
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Lessee, Operating Lease Payment on Extension Option $ 3,244,000  
Minimum future obligations    
2020 4,467,000  
2021 4,461,000  
2022 4,303,000  
2023 3,920,000  
2024 3,893,000  
Thereafter 16,566,000  
Lessee, Operating Lease, Liability, Payments, Due 37,610,000  
Interest (9,897,000)  
Present value of lease payments $ 27,713,000 $ 24,792