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Employee Stock Purchase Plan, Stock Options and Warrants - PSUs and RSUs Granted (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-Settled Performance-Based Restricted Stock Units      
PSUs and RSUs Granted      
Granted (in shares) 103    
Weighted average grant-date fair value (in dollars per share) $ 61.39 $ 43.63  
Vested (in shares) 26 0 0
Stock-Settled Performance-Based Restricted Stock Units | Target units granted      
PSUs and RSUs Granted      
Granted (in shares) 52 61  
Stock-Settled Performance-Based Restricted Stock Units | Maximum units granted      
PSUs and RSUs Granted      
Granted (in shares) 103 102  
Stock-Settled Performance-Based Restricted Stock Units | Maximum potential shares      
PSUs and RSUs Granted      
Granted (in shares) 129 127  
Stock-Settled Performance-Based Restricted Stock Units | rTSR      
PSUs and RSUs Granted      
Multiplying factor 125.00%    
Stock-Settled Performance-Based Restricted Stock Units | rTSR | Maximum      
PSUs and RSUs Granted      
Multiplying factor 125.00%    
Stock-Settled Performance-Based Restricted Stock Units | FCF | Maximum      
PSUs and RSUs Granted      
Multiplying factor 100.00% 100.00% 200.00%
Restricted Stock Units      
PSUs and RSUs Granted      
Granted (in shares) 26 34  
Weighted average grant-date fair value (in dollars per share) $ 61.77 $ 42.98  
Vested (in shares) 34 0 0