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Goodwill and Intangible Assets, Net - Estimated Future Annual Amortization Expense Related to Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Estimated Future Amortization expense    
2019 (remaining 9 months) $ 5,400  
2020 6,052  
2021 2,459  
2022 2,259  
2023 2,100  
Thereafter 4,967  
Net $ 23,237 $ 24,370