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Stockholders' Equity (Schedule of Stock Awards) (Details) - Stock Awards - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Balance at beginning of the period (in shares) 271,819 232,622 262,456
Issued (in shares) 5,641    
Granted (in shares) 111,246 103,382 86,918
Dividend equivalents (in shares) 6,280 5,249 3,811
Forfeited (in shares) (71,618)   (10,832)
Vested (in shares) (136,000) (69,434) (109,731)
Balance at end of the period (in shares) 187,368 271,819 232,622
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Outstanding exercise price (in usd per share) $ 70.29 $ 55.60 $ 49.36
Issued (in usd per share) 106.10    
Granted (in usd per share) 106.10 90.36 54.47
Dividend equivalents (in usd per share) 90.47 104.93 88.04
Forfeited (in usd per share) 86.65   53.95
Vested (in usd per share) 64.32 51.20 39.94
Outstanding exercise price (in usd per share) $ 91.39 $ 70.29 $ 55.60