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Leases - (Future Minimum Operating Lease Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 26,554
2020 22,349
2021 18,430
2022 13,552
2023 9,041
Thereafter 8,697
Total minimum operating lease payments $ 98,623