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Leases - Future Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 8,203
2020 8,307
2021 8,137
2022 7,837
2023 7,021
Thereafter 111,653
Future minimum lease payments $ 151,158