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Leases (Future Minimum Lease Payments Under Non-cancelable Operating Leases - Prior to Adoption of ASC 842 Leases) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 11,900
2020 9,986
2021 7,785
2022 6,856
2023 4,478
Thereafter 7,725
Total future minimum lease payments $ 48,730