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Commitments and Contingencies - Future Minimum Annual Payments under Operating Lease Agreements (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2020 $ 8,331
2021 6,886
2022 4,402
2023 2,415
2024 1,470
Thereafter 1,836
Total future minimum payments $ 25,340