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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Share-Based Compensation  
Schedule of restricted stock and performance-based restricted stock activity

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Shares 

    

Weighted

​

Performance-based

    

Weighted

​

​

Under

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Average

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Shares Under

​

Average

​

​

Restriction

​

Fair Value

​

Restriction

​

Fair Value

Outstanding at beginning of year

 

78,202

​

$

79.09

​

84,105

​

$

79.34

Granted

 

34,799

​

​

90.10

​

36,649

(1)

​

84.68

Vested and unrestricted

 

(43,480)

​

​

78.07

​

(42,123)

​

​

73.55

Forfeited

​

—

​

​

—

​

(1,868)

​

​

84.61

Outstanding at end of period

 

69,521

​

$

85.24

​

76,763

​

$

84.94

(1)Includes a true-up of previously awarded performance-based restricted share awards. The updated shares were calculated based on the attainment of pre-established performance objectives and granted under the 2002 Incentive Plan.