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Leases - Future Minimum Lease Payments - ASC 840 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 9,913
2020 8,762
2021 7,493
2022 6,829
2023 6,082
Thereafter 39,481
Total minimum lease payments $ 78,560