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Earnings Per Share (Narrative) (Details) - shares
12 Months Ended
Oct. 25, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock outstanding, excluding stock issued (in shares) 193,663,150      
Vested (in shares)   0    
Boeing | Common Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock sold (in shares) 1,924,402      
Merger Agreement        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Transaction costs, settled with stock, shares (in shares) 413,486      
Director | Restricted stock units | Merger Agreement        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Vested (in shares) 1,500,000      
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential effect of warrants to purchase stock   30,999,977 30,999,977 30,999,977