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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2019 $ 36,849  
2020 46,651  
2021 44,131  
2022 40,359  
2023 32,242  
Thereafter 72,838  
Intangible Assets, Net $ 273,070 $ 277,180