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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in IPR&D      
Beginning balance $ 23,000 $ 23,000  
Change in IPR&D 0 0 $ 463,700
Ending balance 23,000 23,000 $ 23,000
Changes in goodwill      
Beginning balance 197,797    
Change in goodwill 0 0  
Ending balance $ 197,797 $ 197,797