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Goodwill and Other Intangible Assets - Future Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Estimated future aggregate amortization expense    
2019 $ 4,635  
2020 4,595  
2021 4,352  
2022 3,867  
2023 3,867  
Thereafter 14,121  
Intangible assets subject to amortization, Net Book Value $ 35,437 $ 40,093