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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Estimated amortization expense related to amortized intangible assets    
2019 $ 9,865  
2020 8,374  
2021 7,391  
2022 5,878  
2023 4,701  
Thereafter 14,625  
Amortized intangible assets, Net Carrying Value $ 50,834 $ 62,321