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Operating Leases - Minimum Annual Lease Payments Under Non-cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 385
2021 376
2022 304
2023 309
2024 324
Thereafter 2,947
Total minimum payments required 4,645
Less imputed interest 989
Present value of lease liabilities $ 3,656