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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense Related to Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Estimated amortization expense related to amortized intangible assets    
Remainder of 2019 $ 7,437  
2020 8,419  
2021 7,432  
2022 5,908  
2023 4,721  
Thereafter 14,784  
Intangible assets subject to amortization, Net Carrying Value $ 48,701 $ 50,834