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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated amortization expense related to amortized intangible assets    
Remainder of 2019 $ 2,569  
2020 10,030  
2021 8,987  
2022 7,698  
2023 6,481  
Thereafter 43,804  
Intangible assets subject to amortization, Net Carrying Value $ 79,569 $ 50,834