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Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets, Net      
Amortization expense $ 21,500 $ 21,500 $ 12,600
Amortization Expense      
2019 21,536    
2020 21,536    
2021 21,536    
2022 21,536    
2023 21,536    
Thereafter 107,684    
Changes to carrying amount of goodwill      
Changes to the carry amount of goodwill $ 0 0  
Licensed IP      
Intangible assets      
Weighted Average Useful Lives (Years) 12 years 6 months    
Finite-lived intangible assets:      
Gross Carrying Amount $ 271,000 271,000  
Accumulated Amortization 55,636 34,099  
Net Carrying Amount $ 215,364 $ 236,901