Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

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

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Goodwill and Other Intangible Assets (Schedule of Estimated Amortization Expense Relating to Intangible Assets) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 3 months of 2018 $ 8,122
2019 31,995
2020 31,659
2021 31,099
2022 9,993
Thereafter 4,580
Net Book Value $ 117,448