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Goodwill and Other Intangible Assets - Projected Annual Amortization Expense for Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 92,786  
2020 94,756  
2021 90,395  
2022 71,694  
2023 69,828  
Thereafter 218,631  
Definite-lived intangible assets, Net Carrying Amount $ 638,090 $ 657,180