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Goodwill and Identified Intangible Assets - Estimated Future Amortization Expense (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 13,200
2016 13,243
2017 13,250
2018 13,079
2019 $ 12,936