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Stockholders' Equity (Stock Awards and Units Activity) (Details)
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Deferred And Restricted Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 346,148
Issued (in shares) | shares 4,582
Granted (in shares) | shares 150,319
Dividend equivalents (in shares) | shares 8,185
Forfeited (in shares) | shares (15,219)
Vested (in shares) | shares (153,411)
Outstanding at end of period (in shares) | shares 340,604
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 87.54
Issued (in usd per share) | $ / shares 89.53
Granted (in usd per share) | $ / shares 97.70
Dividend equivalents (in usd per share) | $ / shares 86.22
Forfeited (in usd per share) | $ / shares 91.53
Vested (in usd per share) | $ / shares 87.64
Outstanding at end of period (in usd per share) | $ / shares $ 89.98
Stock Awards and Performance Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 129,128
Granted (in shares) | shares 66,029
Dividend equivalents (in shares) | shares 2,636
Forfeited (in shares) | shares (73,581)
Vested (in shares) | shares (5,152)
Outstanding at end of period (in shares) | shares 119,060
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 96.21
Granted (in usd per share) | $ / shares 98.98
Dividend equivalents (in usd per share) | $ / shares 87.02
Forfeited (in usd per share) | $ / shares 107.91
Vested (in usd per share) | $ / shares 100.46
Outstanding at end of period (in usd per share) | $ / shares $ 89.92