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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 13,770
2019 13,572
2020 13,518
2021 13,335
2022 $ 13,335