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Commitments and Contingencies - Future Payments Under Operating Leases (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 39,247
2018 31,210
2019 25,527
2020 18,511
2021 14,838
Thereafter 51,448
Total 180,781
Operating Leases  
Operating Leased Assets [Line Items]  
2017 34,279
2018 28,740
2019 23,357
2020 16,289
2021 13,209
Thereafter 48,259
Total 164,133
Operating Leases under restructuring [Member]  
Operating Leased Assets [Line Items]  
2017 4,968
2018 2,470
2019 2,170
2020 2,222
2021 1,629
Thereafter 3,189
Total $ 16,648