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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 47,135  
2020 44,980  
2021 42,657  
2022 39,129  
2023 31,323  
Thereafter 71,956  
Finite-Lived Intangible Assets, Net $ 277,180 $ 263,179