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Leases - Future rent commitments (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Projected minimum rental payments under the terms of leases  
2019 $ 1,628
2020 2,094
2021 1,573
2022 1,406
2023 1,249
Thereafter 4,498
Amounts representing interest (1,466)
Present value of net future minimum lease payments $ 10,982