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Share-Based Payments - Market Stock Units Activity (Details) - Market stock units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares      
Beginning balance, unvested (in shares) 201    
Granted (in shares) 151    
Vested (in shares) (80)    
Forfeited (in shares) (15)    
Ending balance, unvested shares (in shares) 257 201  
Weighted Average Grant Date Fair Value      
Beginning balance, unvested (in dollars per share) $ 388.98    
Granted (in dollars per share) 358.77 $ 398.61 $ 378.08
Vested (in dollars per share) 382.95    
Forfeited (in dollars per share) 383.72    
Ending balance, unvested (in dollars per share) $ 372.08 $ 388.98