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Employee Stock Purchase Plan, Stock Options and Warrants - Changes in PSUs and RSUs (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-Settled Performance-Based Restricted Stock Units      
Stock Units      
Beginning balance (in shares) 102    
Granted (in shares) 103    
rTSR adjustment (in shares) 5    
Vested (in shares) (26) 0 0
Forfeited (in shares) (21)    
Balance at December 31 (in shares) 163 102  
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 43.63    
Granted (in dollars per share) 61.39 $ 43.63  
rTSR adjustment (in dollars per share) 43.43    
Vested (in dollars per share) 43.43    
Forfeited (in dollars per share) 52.56    
Balance at December 31 (in dollars per share) $ 53.71 $ 43.63  
Stock-Settled Performance-Based Restricted Stock Units | rTSR      
Stock Units      
Multiplying factor 125.00%    
Stock-Settled Performance-Based Restricted Stock Units | rTSR | Minimum      
Stock Units      
Multiplying factor 75.00%    
Stock-Settled Performance-Based Restricted Stock Units | rTSR | Maximum      
Stock Units      
Multiplying factor 125.00%    
Restricted Stock Units      
Stock Units      
Beginning balance (in shares) 34    
Granted (in shares) 26 34  
Vested (in shares) (34) 0 0
Balance at December 31 (in shares) 26 34  
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 42.98    
Granted (in dollars per share) 61.77 $ 42.98  
Vested (in dollars per share) 42.98    
Balance at December 31 (in dollars per share) $ 61.77 $ 42.98