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Stockholders' Equity (Stock Awards and Units Activity) (Details)
6 Months Ended
Jun. 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 3,436
Granted (in shares) | shares 248,043
Dividend equivalents (in shares) | shares 5,642
Forfeited (in shares) | shares (6,175)
Vested (in shares) | shares 148,538
Outstanding at end of period (in shares) | shares 366,814
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 83.84
Issued (in usd per share) | $ / shares 82.84
Granted (in usd per share) | $ / shares 80.89
Dividend equivalents (in usd per share) | $ / shares 81.42
Forfeited (in usd per share) | $ / shares 91.37
Vested (in usd per share) | $ / shares 74.58
Outstanding at end of period (in usd per share) | $ / shares $ 84.45
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 1,998
Forfeited (in shares) | shares (8,459)
Vested (in shares) | shares 102,434
Outstanding at end of period (in shares) | shares 127,468
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 81.33
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 $ 96.12