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Stockholders' Equity (Stock Awards and Units Activity) (Details)
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Deferred And Restricted Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 285,711
Issued (in shares) | shares 1,405
Granted (in shares) | shares 142,924
Dividend equivalents (in shares) | shares 2,390
Forfeited (in shares) | shares (950)
Vested (in shares) | shares (147,201)
Outstanding at end of period (in shares) | shares 284,279
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 110.41
Issued (in usd per share) | $ / shares 103.81
Granted (in usd per share) | $ / shares 122.04
Dividend equivalents (in usd per share) | $ / shares 105.22
Forfeited (in usd per share) | $ / shares 110.28
Vested (in usd per share) | $ / shares 93.20
Outstanding at end of period (in usd per share) | $ / shares $ 121.85
Stock Awards and Performance Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 149,961
Granted (in shares) | shares 91,988
Dividend equivalents (in shares) | shares 1,336
Forfeited (in shares) | shares (4,840)
Vested (in shares) | shares (80,938)
Outstanding at end of period (in shares) | shares 157,507
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 104.01
Granted (in usd per share) | $ / shares 110.83
Dividend equivalents (in usd per share) | $ / shares 105.22
Forfeited (in usd per share) | $ / shares 78.11
Vested (in usd per share) | $ / shares 82.40
Outstanding at end of period (in usd per share) | $ / shares $ 116.63