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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Estimated amortization expense    
2019 (October 1 - December 31) $ 6,931  
2020 27,331  
2021 27,214  
2022 26,123  
2023 24,913  
Thereafter 83,907  
Total estimated amortization expense $ 196,419 $ 77,206