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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 16,078
2018 14,102
2019 13,914
2020 13,766
2021 $ 13,605