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Leases - Projected Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 5,735
2020 5,949
2021 5,512
2022 4,844
2023 4,744
Thereafter 35,260
Total minimum lease payments $ 62,044