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Commitments and Contingencies (Details) - Future Minimum Annual Lease Payments Under Operating Leases
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 1,280
2020 1,287
2021 1,283
2022 1,304
2023 1,330
Thereafter 33,939
Total minimum lease payments $ 40,423