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Goodwill and Other Intangible Assets - Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated future aggregate amortization expense    
2019 $ 1,150  
2020 4,595  
2021 4,352  
2022 3,867  
2023 3,867  
Thereafter 14,120  
Intangible assets subject to amortization, Net Book Value $ 31,951 $ 35,437