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Commitments and Contingencies - Future Minimum Lease Payments under Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 124,530
2020 81,189
2021 55,827
2022 34,337
2023 21,450
Thereafter 37,217
Total minimum lease payments $ 354,550