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Stockholders' Equity (Stock Awards and Units Activity) (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Deferred And Restricted Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 335,087
Issued (in shares) | shares 1,340
Granted (in shares) | shares 93,615
Dividend equivalents (in shares) | shares 1,639
Forfeited (in shares) | shares (973)
Vested (in shares) | shares (139,913)
Outstanding at end of period (in shares) | shares 290,795
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 90.04
Issued (in usd per share) | $ / shares 132.28
Granted (in usd per share) | $ / shares 143.53
Dividend equivalents (in usd per share) | $ / shares 131.62
Forfeited (in usd per share) | $ / shares 96.55
Vested (in usd per share) | $ / shares 86.42
Outstanding at end of period (in usd per share) | $ / shares $ 106.32
Stock Awards and Performance Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 119,727
Granted (in shares) | shares 40,102
Dividend equivalents (in shares) | shares 833
Forfeited (in shares) | shares (1,053)
Vested (in shares) | shares (12,593)
Outstanding at end of period (in shares) | shares 147,016
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 89.92
Granted (in usd per share) | $ / shares 143.54
Dividend equivalents (in usd per share) | $ / shares 131.62
Forfeited (in usd per share) | $ / shares 96.55
Vested (in usd per share) | $ / shares 95.03
Outstanding at end of period (in usd per share) | $ / shares $ 104.01