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Commitments and Contingencies - Future Aggregate Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments and Contingencies  
2020 $ 6,405
2021 5,279
2022 4,592
2023 3,567
2024 and thereafter 10,197
Total $ 30,040