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Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Amortized Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Estimated amortization expense related to amortized intangible assets    
2018 $ 11,013  
2019 9,945  
2020 8,444  
2021 7,447  
2022 5,895  
Thereafter 19,577  
Amortized intangible assets, Net Carrying Value $ 62,321 $ 73,213