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Intangible Assets and Goodwill Intangible Assets Future Amortization Expense (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 1,210
2020 938
2021 732
2022 539
2023 298
Thereafter 530
Other Finite-Lived Intangible Assets, Gross $ 4,247