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Intangible Assets - Estimated Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (remaining 9 months) $ 18,823  
2020 25,095  
2021 25,095  
2022 25,095  
2023 25,095  
Thereafter 74,700  
Net Carrying Value $ 193,903 $ 200,176