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STOCK AWARD PLANS (Tables)
9 Months Ended
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation cost breakdown in statement of earnings
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 for the three months and nine months ended September 30, 2014 and 2013 were as follows (in thousands):

 
Three months ended
September 30,
 
Nine months ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
Compensation cost  
 
$
3,551
  
$
3,860
  
$
8,824
  
$
8,921
 
Income tax benefit  
 
$
1,329
  
$
1,459
  
$
3,327
  
$
3,372
 
Summary of Stock option valuation assumptions
The fair value of each stock option was determined using the Black-Scholes option pricing model. The key input variables used in valuing the options during the nine months ended September 30, 2014 and 2013 were as follows:

  
Nine months ended
September 30,
 
  
2014
  
2013
 
Dividend yield  
 
None
  
None
 
Average risk-free interest rate  
  
2.0
%
  
1.1
%
Stock price volatility  
  
33
%
  
34
%
Estimated option term  
 
Six or seven years
  
Six or seven years
 
Employee Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock option activity
The following is a summary of the restricted stock award activity under the employee plan described above for the nine months ended September 30, 2014:
  
Unvested
Restricted
Stock Award
Shares
  
Weighted
Average
Grant Date
Fair Value
Per Share
 
Nonvested balance at December 31, 2013  
  
399,278
  
$
54.92
 
Granted  
  
97,706
  
$
97.46
 
Vested  
  
(141,700
)
 
$
45.62
 
Forfeited  
  
(31,589
)
 
$
62.69
 
Nonvested balance at September 30, 2014  
  
323,695
  
$
71.07
 

Summary of outstanding and exercisable stock options
The following table summarizes information about the Company’s outstanding and exercisable stock options under the director plan at September 30, 2014:

  
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
$
20.28 - $29.60
   
30,000
   
2.2
  
$
25.87
    
30,000
  
$
25.87
   
$
35.17 - $36.82
   
32,048
   
1.5
  
$
36.09
    
32,048
  
$
36.09
   
$
41.24 - $56.45
   
91,022
   
4.5
  
$
51.87
    
91,022
  
$
51.87
   
$
61.89 - $62.48
   
54,306
   
6.0
  
$
62.37
    
54,306
  
$
62.37
   
$
75.17 - $99.52
   
90,958
   
7.4
  
$
86.41
    
48,958
  
$
75.17
   
$
20.28 - $99.52
   
298,334
   
5.1
  
$
60.01
 
$17,257,000
  
256,334
  
$
53.53
 
$16,487,000
Summary of restricted stock award activity
The following is a summary of the restricted stock award activity under the director plan described above for the nine months ended September 30, 2014:

  
Unvested
Restricted
Stock Award
Shares
  
Weighted
Average
Grant Date
Fair Value
Per Share
 
Nonvested balance at December 31, 2013  
  
384
  
$
75.65
 
Granted  
  
8,160
  
$
99.52
 
Vested  
  
(960
)
 
$
89.97
 
Nonvested balance at September 30, 2014  
  
7,584
  
$
99.52
 
Director Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock option activity
The following is a summary of the stock option activity under the employee plan described above for the nine months ended September 30, 2014:

  
Outstanding
Non-
Qualified or
Nonincentive
Stock
Awards
  
Weighted
Average
Exercise Price
 
Outstanding at December 31, 2013  
  
379,604
  
$
55.42
 
Granted  
  
75,204
  
$
98.91
 
Exercised  
  
(117,677
)
 
$
41.72
 
Forfeited  
  
(12,576
)
 
$
68.89
 
Outstanding at September 30, 2014  
  
324,555
  
$
69.94
 
Summary of outstanding and exercisable stock options
The following table summarizes information about the Company’s outstanding and exercisable stock options under the employee plan at September 30, 2014:

  
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
$
31.35 - $ 36.35
   
16,910
   
2.4
  
$
32.82
      
16,910
    
$
32.82
   
$
46.74
   
56,629
   
3.3
  
$
46.74
      
56,629
    
$
46.74
   
$
65.28 - $ 70.65
   
173,845
   
4.9
  
$
68.38
      
84,545
    
$
67.57
   
$
86.96 - $ 96.85
   
37,730
   
6.3
  
$
93.89
      
655
    
$
86.96
 
$
101.46 -$114.11
   
39,441
   
6.4
  
$
103.12
    
    
$
   
$
31.35 -$114.11
   
324,555
   
4.8
  
$
69.94
 
$15,549,000
    
158,739
    
$
56.52
 
$9,736,000
Summary of restricted stock award activity
The following is a summary of the restricted stock award activity under the employee plan described above for the nine months ended September 30, 2014:
  
Unvested
Restricted
Stock Award
Shares
  
Weighted
Average
Grant Date
Fair Value
Per Share
 
Nonvested balance at December 31, 2013  
  
399,278
  
$
54.92
 
Granted  
  
97,706
  
$
97.46
 
Vested  
  
(141,700
)
 
$
45.62
 
Forfeited  
  
(31,589
)
 
$
62.69
 
Nonvested balance at September 30, 2014  
  
323,695
  
$
71.07