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Stockholders' Equity (Schedule of Stock Awards) (Details) - Stock Awards - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Balance at beginning of the period (in shares) 129,128 187,368 271,819
Issued (in shares)     5,641
Granted (in shares) 66,029 48,995 111,246
Dividend equivalents (in shares) 3,303 3,658 6,280
Forfeited (in shares) (73,581) (8,459) (71,618)
Vested (in shares) (5,152) (102,434) (136,000)
Balance at end of the period (in shares) 119,727 129,128 187,368
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) $ 96.21 $ 91.39 $ 70.29
Issued (in usd per share)     106.10
Granted (in usd per share) 98.98 78.11 106.10
Dividend equivalents (in usd per share) 96.54 67.03 90.47
Forfeited (in usd per share) 107.91 106.10 86.65
Vested (in usd per share) 100.46 77.93 64.32
Outstanding exercise price (in usd per share) $ 89.92 $ 96.21 $ 91.39