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Goodwill and Related Intangible Assets (Schedule of Future Amortization Expense) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 7,213
2019 6,921
2020 6,726
2021 6,248
2022 $ 5,709