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Leases - Future Minimum Operating Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2018 (excluding the three months ended March 31, 2018) $ 1,640
2019 1,579
2020 1,625
2021 1,673
2022 205
Thereafter 0
Total lease payments $ 6,722