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Stock Award Plans
 12 Months Ended
Dec. 31, 2020
Stock Award Plans [Abstract]  
Stock Award Plans
(8)
Stock Award Plans


The Company has share-based compensation plans which are described below. The compensation cost that has been charged against earnings for the Company’s stock award plans and the income tax benefit recognized in the statement of earnings for stock awards were as follows (in thousands):

  
Year Ended December 31,
  
   
2020
    
2019
    
2018
  
Compensation cost
  
$
14,722
    
$
13,612
    
$
19,104
  
Income tax benefit
  
$
4,143
    
$
3,368
    
$
5,903
  


The Company has an employee stock award plan for selected officers and other key employees which provides for the issuance of stock options, restricted stock awards and performance awards. On February 19, 2018, the employee stock award plan was amended to also allow for the granting of RSUs to selected officers and other key employees. Restricted stock and RSUs generally vest ratably over five years, however, the amendment included a provision for the continued vesting of unvested stock options and RSUs for employees who meet certain years of service and age requirements at the time of their retirement. The vesting change resulted in shorter expense accrual periods on stock options and RSUs granted after February 19, 2018 to employees who are nearing retirement and meet the service and age requirements.


The exercise price for each option equals the fair market value per share of the Company’s common stock on the date of grant. Substantially all stock options outstanding under the plan have terms of seven years and vest ratably over three years. No performance awards payable in stock have been awarded under the plan. At December 31, 2020, 1,100,687 shares were available for future grants under the employee plan and no outstanding stock options under the employee plan were issued with stock appreciation rights.


The following is a summary of the stock option activity under the employee plan described above:

  
Outstanding
Non-
Qualified or
Nonincentive
Stock
Awards
    
Weighted
Average
Exercise
Price
  
Outstanding at December 31, 2019
    
486,059
    
$
71.65
  
Granted
    
114,600
    
$
73.29
  
Exercised
    
(19,851
)
  
$
64.42
  
Canceled or expired
    
(3,291
)
  
$
95.18
  
Outstanding at December 31, 2020
    
577,517
    
$
72.09
  



The following table summarizes information about the Company’s outstanding and exercisable stock options under the employee plan at December 31, 2020:

    
Options Outstanding
    
Options Exercisable
  
Range of Exercise
Prices
    
Number
Outstanding
    
Weighted
Average
Remaining
Contractual
Life in
Years
    
Weighted
Average
Exercise
Price
    
Aggregated
Intrinsic
Value
    
Number
Exercisable
    
Weighted
Average
Exercise
Price
    
Aggregated
Intrinsic
Value
  
$
51.23
      
62,315
      
2.1
    
$
51.23
      
-
      
62,315
    
$
51.23
      
-
  
$
64.65 – $68.50
      
94,218
      
3.5
    
$
67.26
              
63,218
    
$
68.43
          
$
73.29 – $75.50
      
380,289
      
4.6
    
$
74.32
              
157,176
    
$
74.98
          
$
84.90 – $101.46
      
40,695
      
1.0
    
$
94.31
              
36,225
    
$
95.47
          
$
51.23 – $101.46
      
577,517
      
3.9
    
$
72.09
    
$
37,000
      
318,934
    
$
71.37
    
$
37,000
  


The following is a summary of the restricted stock award activity under the employee plan described above:

  
Unvested
Restricted
Stock Award
Shares
    
Weighted
Average
Grant Date
Fair Value
Per Share
  
Nonvested balance at December 31, 2019
    
134,669
    
$
63.28
  
Vested
    
(48,450
)
  
$
63.24
  
Forfeited
    
(2,317
)
  
$
62.46
  
Nonvested balance at December 31, 2020
    
83,902
    
$
63.33
  


No restricted stock awards were granted under the employee plan during 2020, 2019, or 2018.


The following is a summary of RSU activity under the employee plan described above:

  
Unvested RSUs
    
Weighted
Average Grant
Date Fair Value
Per Unit
  
Nonvested balance at December 31, 2019
    
255,167
    
$
74.96
  
Granted
    
153,460
    
$
73.04
  
Vested
    
(64,039
)
  
$
75.08
  
Forfeited
    
(6,170
)
  
$
73.91
  
Nonvested balance at December 31, 2020
    
338,418
    
$
74.09
  


The weighted average grant date fair value of RSUs granted for the years ended December 31, 2020, 2019, and 2018 was $73.04, $74.46, and $75.59, respectively.


During January 2021, the Company granted 309,506 RSUs to selected officers and other key employees under its employee stock award plan, the majority of which vest ratably over five years.


The Company has a stock award plan for nonemployee directors of the Company which provides for the issuance of stock options and restricted stock. The director plan provides for automatic grants of restricted stock to nonemployee directors after each annual meeting of stockholders. In addition, the director plan allows for the issuance of stock options or restricted stock in lieu of cash for all or part of the annual director fee at the option of the director. The exercise prices for all options granted under the plan are equal to the fair market value per share of the Company’s common stock on the date of grant. The terms of the options are ten years. The restricted stock issued after each annual meeting of stockholders vests six months after the date of grant. Options granted and restricted stock issued in lieu of cash director fees vest in equal quarterly increments during the year to which they relate. At December 31, 2020, 421,220 shares were available for future grants under the director plan. The director stock award plan is intended as an incentive to attract and retain qualified independent directors.


The following is a summary of the stock option activity under the director plan described above:

  
Outstanding
Non-
Qualified or
Nonincentive
Stock
Awards
    
Weighted
Average
Exercise
Price
  
Outstanding at December 31, 2019
    
115,756
    
$
73.68
  
Exercised
    
(12,000
)
  
$
41.24
  
Outstanding at December 31, 2020
    
103,756
    
$
77.44
  


The following table summarizes information about the Company’s outstanding and exercisable stock options under the director plan at December 31, 2020:

    
Options Outstanding
    
Options Exercisable
  
Range of Exercise
Prices
    
Number
Outstanding
    
Weighted
Average
Remaining
Contractual
Life in
Years
    
Weighted
Average
Exercise
Price
    
Aggregate
Intrinsic
Value
    
Number
Exercisable
    
Weighted
Average
Exercise
Price
    
Aggregate
Intrinsic
Value
  
$
56.45
      
13,276
      
0.3
    
$
56.45
      
-
      
13,276
    
$
56.45
      
-
  
$
61.89 – $62.48
      
22,000
      
1.6
    
$
62.21
              
22,000
    
$
62.21
          
$
70.65 – $99.52
      
68,480
      
3.4
    
$
86.39
              
68,480
    
$
86.39
          
$
56.45 – $99.52
      
103,756
      
2.6
    
$
77.44
    
$
—
      
103,756
    
$
77.44
    
$
—
  


The following is a summary of the restricted stock award activity under the director plan described above:

  
Unvested
Restricted
Stock Award
Shares
    
Weighted
Average
Grant Date
Fair Value
Per Share
  
Nonvested balance at December 31, 2019
    
1,739
    
$
83.68
  
Granted
    
39,913
    
$
49.84
  
Vested
    
(40,748
)
  
$
51.28
  
Nonvested balance at December 31, 2020
    
904
    
$
49.84
  


The weighted average grant date fair value of restricted stock awards granted under the director plan for the years ended December 31, 2020, 2019, and 2018 were $49.84, $84.81, and $85.70, respectively.


The total intrinsic value of all stock options exercised under all of the Company’s plans was $745,000, $1,655,000 and $6,709,000 for the years ended December 31, 2020, 2019, and 2018, respectively. The actual tax benefit realized for tax deductions from stock option exercises was $210,000, $410,000, and $2,073,000 for the years ended December 31, 2020, 2019, and 2018, respectively.


The total fair value of all the restricted stock vestings under all of the Company’s plans was $5,649,000, $5,917,000, and $12,936,000 for the years ended December 31, 2020, 2019, and 2018, respectively. The actual tax benefit realized for tax deductions from restricted stock vestings was $1,590,000, $1,464,000, and $3,997,000 for the years ended December 31, 2020, 2019, and 2018, respectively.


The total fair value of all the RSU vestings under the Company’s employee plan was $5,172,000 and $1,727,000 for the years ended December 31, 2020 and 2019, respectively.  The actual tax benefit realized for tax deductions from RSU vestings was $1,455,000 and $427,000 for the years ended December 31, 2020 and 2019, respectively.  There were no RSU vestings for the year ended December 31, 2018.


As of December 31, 2020, there was $2,136,000 of unrecognized compensation cost related to nonvested stock options, $1,468,000 related to restricted stock and $13,298,000 related to nonvested RSUs. The stock options are expected to be recognized over a weighted average period of approximately 1.7 years, restricted stock over approximately 0.6 years and RSUs over approximately 3.3 years.


The weighted average per share fair value of stock options granted during the years ended December 31, 2020, 2019, and 2018 was $20.19, $22.77, and $23.53, respectively. The fair value of the stock options granted during the years ended December 31, 2020, 2019, and 2018 was $2,314,000, $2,666,000, and $2,787,000, respectively. The Company currently uses treasury stock shares for restricted stock grants, RSU vestings and stock option exercises. The fair value of each stock option was determined using the Black-Scholes option pricing model.


The key input variables used in valuing the stock options granted were as follows:

   
Year Ended December 31,
  
 
2020
    
2019
    
2018
  
Dividend yield
  
None
    
None
    
None
  
Average risk-free interest rate
    
1.3
%
    
2.5
%
    
2.7
%
Stock price volatility
    
28
%
    
28
%
    
27
%
Estimated option term
  
5.3 years
    
5.3 years
    
5.5 years