Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other Intangible Assets (Schedule of Estimated Amortization Expense Relating to Intangible Assets) (Details)

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Other Intangible Assets (Schedule of Estimated Amortization Expense Relating to Intangible Assets) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Other Intangible Assets [Abstract]  
2018 $ 32,523
2019 32,190
2020 31,852
2021 31,281
2022 10,553
Thereafter 3,723
Net book value of other intangible assets $ 142,122