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Goodwill and Intangible Assets, Net - Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Estimated Amortization Expense    
Year Ending December 31, 2019 $ 41,891  
Year Ending December 31, 2020 37,123  
Year Ending December 31, 2021 31,022  
Year Ending December 31, 2022 27,972  
Year Ending December 31, 2023 18,207  
Thereafter 60,818  
Total $ 217,033 $ 296,379