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Stockholders' Equity (Stock Awards and Units Activity) (Details)
3 Months Ended
Mar. 31, 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 2,175
Granted (in shares) | shares 135,475
Dividend equivalents (in shares) | shares 3,849
Forfeited (in shares) | shares (3,354)
Vested (in shares) | shares (130,266)
Outstanding at end of period (in shares) | shares 354,027
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 87.54
Issued (in usd per share) | $ / shares 66.83
Granted (in usd per share) | $ / shares 98.01
Dividend equivalents (in usd per share) | $ / shares 58.70
Forfeited (in usd per share) | $ / shares 92.45
Vested (in usd per share) | $ / shares 87.61
Outstanding at end of period (in usd per share) | $ / shares $ 89.73
Stock Awards and Performance Stock Units  
Number of Shares  
Outstanding at beginning of period (in shares) | shares 129,128
Granted (in shares) | shares 57,333
Dividend equivalents (in shares) | shares 1,193
Forfeited (in shares) | shares (73,581)
Vested (in shares) | shares (5,152)
Outstanding at end of period (in shares) | shares 108,921
Weighted Average Price  
Outstanding at beginning of period (in usd per share) | $ / shares $ 96.21
Granted (in usd per share) | $ / shares 96.55
Dividend equivalents (in usd per share) | $ / shares 58.70
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 $ 87.92