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Commitments and Contingencies - Future Minimum Rental Payments Required Under Non-Cancelable Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies  
2019 $ 3,817
2020 3,081
2021 2,671
2022 2,244
2023 1,941
Thereafter 8,870
Total $ 22,624