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Stockholders' Equity (Stock Awards and Units Activity) (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Deferred And Restricted Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 264,406
Issued (in shares) | shares 4,856
Granted (in shares) | shares 248,043
Dividend equivalents (in shares) | shares 8,163
Forfeited (in shares) | shares (7,858)
Vested (in shares) | shares (150,538)
Outstanding at end of period (in shares) | shares 367,072
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 83.84
Issued (in usd per share) | $ / shares 85.48
Granted (in usd per share) | $ / shares 80.89
Dividend equivalents (in usd per share) | $ / shares 85.19
Forfeited (in usd per share) | $ / shares 90.83
Vested (in usd per share) | $ / shares 74.74
Outstanding at end of period (in usd per share) | $ / shares $ 84.43
Stock Awards and Performance Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 187,368
Granted (in shares) | shares 48,995
Dividend equivalents (in shares) | shares 2,881
Forfeited (in shares) | shares (8,459)
Vested (in shares) | shares (102,434)
Outstanding at end of period (in shares) | shares 128,351
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 91.39
Granted (in usd per share) | $ / shares 78.11
Dividend equivalents (in usd per share) | $ / shares 85.10
Forfeited (in usd per share) | $ / shares 106.10
Vested (in usd per share) | $ / shares 77.93
Outstanding at end of period (in usd per share) | $ / shares $ 96.21