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Stock Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Weighted Average Assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used:

 

Grant Year

 

Dividend

Yield

 

 

Expected

Volatility

 

 

Risk Free

Interest Rate

 

 

Expected

Lives

 

2020

 

5%

 

 

45%

 

 

2%

 

 

 

6

 

2019

 

5%

 

 

46%

 

 

2%

 

 

 

6

 

2018

 

5%

 

 

46%

 

 

2%

 

 

 

6

 

Stock Option Transactions under Various Stock-Based Employee Compensation Plans

Information regarding the 1996 Plan for the year ended December 31, 2020 is as follows:

 

 

 

Shares

 

 

Weighted

Average

Exercise

Price

 

 

Weighted

Average

Contractual

Life

 

Outstanding, beginning of year

 

 

608,375

 

 

$

57.97

 

 

 

 

 

Granted

 

 

63,500

 

 

 

71.91

 

 

 

 

 

Exercised

 

 

(61,949

)

 

 

50.66

 

 

 

 

 

Forfeited

 

 

 

 

 

 

 

 

 

 

Expired

 

 

(11,000

)

 

 

50.81

 

 

 

 

 

Outstanding, end of year

 

 

598,926

 

 

 

60.34

 

 

 

5.42

 

Exercisable at end of year

 

 

422,626

 

 

 

55.06

 

 

 

4.25

 

Summary of ESPP Share Activity The following is a summary of 2019 ESPP share activity for the year ended December 31, 2020:

 

 

 

Shares

 

Available for future purchases, January 1, 2020

 

 

438,434

 

Additional shares reserved under 2019 ESPP

 

 

86,093

 

Purchases

 

 

(154,756

)

Available for future purchases, December 31, 2020

 

 

369,771