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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 21,654  
2020 68,933  
2021 66,327  
2022 62,555  
2023 54,316  
Thereafter 154,778  
Intangible Assets, Net $ 428,563 $ 277,180