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Stock-Based Compensation (Schedule of Outstanding Restricted Stock) (Details) - Long-Term Restricted Stock
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Units  
Nonvested, beginning (in shares) | shares 172,105
Granted during the period (in shares) | shares 26,350
Vested during the period (in shares) | shares (6,057)
Forfeited or expired during the period (in shares) | shares (6,819)
Nonvested, ending (in shares) | shares 185,579
Weighted-Average Grant-Date Fair Value  
Nonvested, beginning (in dollars per share) | $ / shares $ 33.80
Granted during the period (in dollars per share) | $ / shares 35.19
Vested during the period (in dollars per share) | $ / shares 36.35
Forfeited or expired during the period (in dollars per share) | $ / shares 37.32
Nonvested, ending (in dollars per share) | $ / shares $ 33.79