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STOCK AWARD PLANS (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2014 and 2013 were as follows (in thousands):

 
Three months ended
June 30,
 
Six months ended
June 30,
 
 
2014
 
2013
 
2014
 
2013
 
Compensation cost                                                                                          
 
$
3,120
  
$
2,927
  
$
5,273
  
$
5,061
 
Income tax benefit                                                                                          
 
$
1,182
  
$
1,106
  
$
1,998
  
$
1,913
 
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 six months ended June 30, 2014 and 2013 were as follows:

 
Six months ended
June 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 stock option activity under the employee plan described above for the six months ended June 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                                                                                                                                      
  
(115,167
)
 
$
41.45
 
Forfeited                                                                                                                                      
  
(12,576
)
 
$
68.89
 
Outstanding at June 30, 2014                                                                                                                                      
  
327,065
  
$
69.82
 
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 June 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
   
2.6
  
$
32.82
     
16,910
  
$
32.82
   
$46.74
   
58,229
   
3.6
  
$
46.74
       
58,229
  
$
46.74
     
$65.28 - $70.65
   
174,755
   
5.1
  
$
68.37
       
85,455
  
$
67.56
     
$86.96 - $96.85
   
37,730
   
6.6
  
$
93.89
      
  
$
     
$101.46-$114.11
   
39,441
   
6.7
  
$
103.12
      
  
$
     
$31.35 -$114.11
   
327,065
   
5.1
  
$
69.82
  
$
15,477,000
   
160,594
  
$
56.35
  
$
9,762,000
 
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 six months ended June 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
  
(141,382
)
 
$
45.60
 
Forfeited
  
(27,880
)
 
$
61.82
 
Nonvested balance at June 30, 2014
  
327,722
  
$
71.04
 
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 director plan described above for the six months ended June 30, 2014:

 
 
Outstanding
Non-
Qualified or
Nonincentive
Stock
Options
  
Weighted
Average
Exercise
Price
 
Outstanding at December 31, 2013
  
320,322
  
$
50.64
 
Granted
  
42,000
  
$
99.52
 
Exercised
  
(63,988
)
 
$
39.08
 
Outstanding at June 30, 2014
  
298,334
  
$
60.01
 
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 June 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
   
2.4
  
$
25.87
     
30,000
  
$
25.87
   
$35.17 - $36.82
   
32,048
   
1.8
  
$
36.09
       
32,048
  
$
36.09
     
$41.24 - $56.45
   
91,022
   
4.7
  
$
51.87
       
91,022
  
$
51.87
     
$61.89 - $62.48
   
54,306
   
6.3
  
$
62.37
       
54,306
  
$
62.37
     
$75.17 - $99.52
   
90,958
   
7.7
  
$
86.41
       
48,958
  
$
75.17
     
$20.28 - $99.52
   
298,334
   
5.4
  
$
60.01
  
$
17,045,000
   
256,334
  
$
53.53
  
$
16,305,000
 
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 six months ended June 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
  
(672
)
 
$
85.88
 
Nonvested balance at June 30, 2014
  
7,872
  
$
99.52