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Other Intangible Assets (Schedule of Estimated Amortization Expense Relating to Intangible Assets) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Other Intangible Assets [Abstract]  
2019 $ 29,274
2020 28,934
2021 28,775
2022 7,791
2023 8,106
Thereafter 4,394
Net book value of other intangible assets $ 107,274