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Leases - Schedule of Future Minimum Lease Payments (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 17,655
2020 16,483
2021 16,202
2022 16,004
2023 15,621
Thereafter 22,226
Total minimum lease payments 104,191
Fleet  
Operating Leased Assets [Line Items]  
2019 17,700
2020 14,700
2021 11,300
2022 8,000
2023 4,600
Thereafter $ 2,300