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Intangible Assets - Schedule of Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 (remaining) $ 23,049  
2020 83,511  
2021 78,778  
2022 34,517  
2023 22,599  
Thereafter 38,703  
Net Carrying Amount $ 281,157 $ 179,518