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Goodwill and Intangible Assets (Future Amortization Expenses) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Estimated amortization expense in 2019 $ 3,683
Estimated amortization expense in 2020 3,683
Estimated amortization expense in 2021 3,683
Estimated amortization expense in 2022 3,336
Estimated amortization expense in 2023 $ 2,989