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Leases - Future minimum lease payments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Future minimum lease payments  
2019 $ 2,765
2020 2,275
2021 2,281
2022 2,183
2023 2,236
Thereafter 1,336
Total minimum lease payments 13,076
Rent expense $ 2,900