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Stockholders' Equity (Warrants) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 15, 2020
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]          
Number of securities called by warrants (in shares) 37,039,106        
Proceeds from the issuance of warrants $ 495,000   $ 14,041 $ 0 $ 0
Payments for Repurchase of Warrants   $ 33,700 $ 33,650 $ 0 $ 0
Warrants Repurchased Rate   48.00%      
Shares issued (in shares)   12,300,000      
Proceeds from warrant exercises   $ 6,500      
Warrant          
Class of Stock [Line Items]          
Proceeds from the issuance of warrants 14,000        
Debt          
Class of Stock [Line Items]          
Proceeds from the issuance of warrants $ 481,000        
Exercise Price Range One          
Class of Stock [Line Items]          
Exercise price of warrants (usd per share) $ 1.66        
Exercise Price Range Two          
Class of Stock [Line Items]          
Exercise price of warrants (usd per share) $ 2.08