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Stock-Based Compensation - Restricted Stock and Market Unit Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units (RSUs)        
Number of Shares        
Nonvested, beginning (in shares) 1,757 1,952 1,937  
Granted (in shares) 786 772 904  
Vested (in shares) (671) (752) (683)  
Forfeited (in shares) (252) (215) (206)  
Nonvested, ending (in shares) 1,620 1,757 1,952  
Weighted Average Grant Date Fair Value        
Nonvested, beginning (in dollars per share) $ 90.75 $ 70.74 $ 58.86 $ 43.50
Granted (in dollars per share) 109.91 82.51 74.75  
Vested (in dollars per share) 64.12 54.77 39.10  
Forfeited (in dollars per share) 81.89 61.02 49.54  
Nonvested, ending (in dollars per share) $ 90.75 $ 70.74 $ 58.86  
Market Stock Units        
Number of Shares        
Nonvested, beginning (in shares) 370 434 260  
Granted (in shares) 125 148 264  
Change in awards based on performance (in shares) 206      
Vested (in shares) (390) (164) (87)  
Forfeited (in shares) (30) (48) (3)  
Nonvested, ending (in shares) 281 370 434  
Weighted Average Grant Date Fair Value        
Nonvested, beginning (in dollars per share) $ 59.74 $ 35.67 $ 28.85 $ 21.98
Granted (in dollars per share) 77.63 32.85 30.31  
Change in awards based on performance (in dollars per share) 39.67      
Vested (in dollars per share) 33.49 15.71 12.76  
Forfeited (in dollars per share) 40.19 33.46 26.34  
Nonvested, ending (in dollars per share) $ 59.74 $ 35.67 $ 28.85