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Stockholders' Equity (Stock Awards and Units Activity) (Details)
6 Months Ended
Jun. 30, 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 2,578
Granted (in shares) | shares 104,116
Dividend equivalents (in shares) | shares 3,658
Forfeited (in shares) | shares (2,386)
Vested (in shares) | shares (157,302)
Outstanding at end of period (in shares) | shares 285,751
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 90.04
Issued (in usd per share) | $ / shares 131.87
Granted (in usd per share) | $ / shares 142.99
Dividend equivalents (in usd per share) | $ / shares 128.47
Forfeited (in usd per share) | $ / shares 112.82
Vested (in usd per share) | $ / shares 86.99
Outstanding at end of period (in usd per share) | $ / shares $ 109.63
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 1,885
Forfeited (in shares) | shares (1,053)
Vested (in shares) | shares (12,593)
Outstanding at end of period (in shares) | shares 148,068
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 128.44
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