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Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Amortized Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Estimated amortization expense related to amortized intangible assets    
Remainder of 2017 $ 2,812  
2018 11,014  
2019 9,946  
2020 8,446  
2021 7,450  
Thereafter 25,544  
Amortized intangible assets, Net Carrying Value $ 65,212 $ 73,213