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Leases - Future Minimum Lease Payments Under Topic 840 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 7,451
2020 6,287
2021 5,407
2022 4,857
2023 4,700
Thereafter 5,893
Total minimum lease payments $ 34,595