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Lease Accounting - Operating Lease Liabilities Maturity Under Topic 840 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 3,826
2020 3,827
2021 3,769
2022 3,834
2023 4,008
Thereafter 28,326
Future minimum payments due $ 47,590