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Stockholders' Equity (Schedule of Stock Awards) (Details) - Stock Awards - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Balance at beginning of the period (in shares) 119,727 129,128 187,368
Granted (in shares) 40,102 66,029 48,995
Dividend equivalents (in shares) 3,778 3,303 3,658
Forfeited (in shares) (1,053) (73,581) (8,459)
Vested (in shares) (12,593) (5,152) (102,434)
Balance at end of the period (in shares) 149,961 119,727 129,128
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) $ 89.92 $ 96.21 $ 91.39
Granted (in usd per share) 143.54 98.98 78.11
Dividend equivalents (in usd per share) 134.82 96.54 67.03
Forfeited (in usd per share) 96.55 107.91 106.10
Vested (in usd per share) 95.03 100.46 77.93
Outstanding exercise price (in usd per share) $ 104.01 $ 89.92 $ 96.21