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Stockholders' Equity (Summary of Nonvested Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Options        
Nonvested at beginning of period     2,378,453  
Options granted     759,820  
Options vested     (1,056,254)  
Options forfeited     (4,526)  
Nonvested at end of period 2,077,493   2,077,493  
Weighted-Average Grant Date Fair Value        
Nonvested at beginning of period (in dollars per share)     $ 9.48  
Options granted (in dollars per share) $ 21.49 $ 14.40 16.76 $ 14.75
Options vested (in dollars per share)     8.41  
Options forfeited (in dollars per share)     13.40  
Nonvested at end of period (in dollars per share) $ 12.68   $ 12.68  
Employee Stock Options [Member]        
Weighted-Average Grant Date Fair Value        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 18.9   $ 18.9  
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 8 months 12 days