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Stock Award Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Stock Award Plans [Abstract]  
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 years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):

 
 
2013
  
2012
  
2011
 
Compensation cost
 
$
11,621
  
$
9,796
  
$
9,228
 
Income tax benefit
 
$
4,370
  
$
3,644
  
$
3,534
 
Summary Of Stock Option Activity Under Employee Plans
The following is a summary of the stock option activity under the employee plan described above for the years ended December 31, 2013, 2012 and 2011:

 
 
Outstanding
Non-Qualified or
Nonincentive
Stock Awards
  
Weighted
Average
Exercise
Price
 
Outstanding at December 31, 2010
  
434,447
  
$
33.53
 
Granted
  
103,021
  
$
47.01
 
Exercised
  
(91,794
)
 
$
32.75
 
Canceled or expired
  
—
  
$
—
 
 
        
Outstanding at December 31, 2011
  
445,674
  
$
36.81
 
Granted
  
99,906
  
$
65.80
 
Exercised
  
(191,955
)
 
$
35.65
 
Canceled or expired
  
(2,452
)
 
$
58.28
 
 
        
Outstanding at December 31, 2012
  
351,173
  
$
45.54
 
Granted
  
111,527
  
$
70.94
 
Exercised
  
(83,096
)
 
$
34.51
 
Canceled or expired
  
—
  
$
—
 
Outstanding at December 31, 2013
  
379,604
  
$
55.42
 

 
The following table summarizes information about the Company’s outstanding and exercisable stock options under the employee plan at December 31, 2013:

  
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
$31.35 — $36.35
   
79,199
   
3.1
  
$
32.62
 
 
  
79,199
   
$
32.62
 
 
$46.74
   
97,703
   
4.1
  
$
46.74
 
 
  
64,173
   
$
46.74
 
 
$65.28 — $66.72
   
96,311
   
5.1
  
$
65.81
 
 
  
31,798
   
$
65.81
 
 
$70.65
104,424
6.1
$
70.65
─
$
─
$86.96
 
 1,967
6.6
$
86.96
 
─
$
─
$31.35 — $86.96
   
379,604
   
4.7
  
$
55.42
 $
16,639,000
  
175,170
   
$
43.81
 
$9,711,000

The following is a summary of the stock option activity under the director plan described above for the years ended December 31, 2013, 2012 and 2011:

 
 
Outstanding
Non-Qualified or
Nonincentive
Stock Awards
  
Weighted
Average
Exercise
Price
 
Outstanding at December 31, 2010
  
356,429
  
$
34.88
 
Granted
  
60,552
  
$
56.42
 
Exercised
  
(63,356
)
 
$
32.17
 
Outstanding at December 31, 2011
  
353,625
  
$
39.05
 
Granted
  
66,306
  
$
62.39
 
Exercised
  
(73,993
)
 
$
28.22
 
Outstanding at December 31, 2012
  
345,938
  
$
45.84
 
Granted
  
54,958
  
$
75.17
 
Exercised
  
(80,574
)
 
$
46.75
 
Outstanding at December 31, 2013
  
320,322
  
$
50.64
 

 
The following table summarizes information about the Company’s outstanding and exercisable stock options under the director plan at December 31, 2013:

  
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
$17.88
   
12,000
   
0.3
  
$
17.88
 
 
  
12,000
  
$
17.88
 
 
$20.28 — $29.60
   
36,000
   
4.0
  
$
26.49
 
 
  
36,000
  
$
26.49
 
 
$35.17 — $36.82
   
50,036
   
2.7
  
$
35.80
 
 
  
50,036
  
$
35.80
 
 
$41.24 — $56.45
   
119,022
   
6.0
  
$
52.05
 
 
  
119,022
  
$
52.05
 
 
$61.89 — $62.48
   
54,306
   
8.5
  
$
62.37
 
 
  
54,306
  
$
62.37
 
 
$75.17
   
48,958
   
9.3
  
$
75.17
 
 
  
48,718
  
$
75.17
 
 
$17.88 — $75.17
   
320,322
   
6.0
  
$
50.64
 
$15,569,000
  
320,082
  
$
50.63
 
$15,564,000
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 years ended December 31, 2013, 2012 and 2011:

 
 
Unvested
Restricted
Stock
Award
Shares
  
Weighted
Average
Grant Date
Fair Value
Per Share
 
Nonvested balance at December 31, 2010
  
499,335
  
$
31.98
 
Granted
  
150,612
  
$
46.50
 
Vested
  
(163,480
)
 
$
33.27
 
Forfeited
  
(10,835
)
 
$
38.90
 
Nonvested balance at December 31, 2011
  
475,632
  
$
36.43
 
Granted
  
121,953
  
$
67.79
 
Vested
  
(168,166
)
 
$
35.43
 
Forfeited
  
(11,291
)
 
$
58.64
 
Nonvested balance at December 31, 2012
  
418,128
  
$
45.39
 
Granted
  
139,971
  
$
69.85
 
Vested
  
(149,162
)
 
$
44.30
 
Forfeited
  
(9,659
)
 
$
61.20
 
Nonvested balance at December 31, 2013
  
399,278
  
$
54.92
 


The following is a summary of the restricted stock award activity under the director plan described above for the years ended December 31, 2013, 2012 and 2011:

 
 
Unvested
Restricted Stock
Award Shares
  
Weighted
Average
Grant Date
Fair Value
Per Share
 
Nonvested balance at December 31, 2010
  
525
  
$
41.33
 
Granted
  
11,990
  
$
56.85
 
Vested
  
(10,767
)
 
$
55.90
 
Nonvested balance at December 31, 2011
  
1,748
  
$
58.07
 
Granted
  
10,383
  
$
62.99
 
Vested
  
(11,783
)
 
$
62.26
 
Nonvested balance at December 31, 2012
  
348
  
$
62.99
 
Granted
  
10,536
  
$
75.65
 
Vested
  
(10,500
)
 
$
75.23
 
Nonvested balance at December 31, 2013
  
384
  
$
75.65
 
Summary Of Stock Option Valuation Assumptions
The key input variables used in valuing the stock options during the years ended December 31, 2013, 2012 and 2011 were as follows:

 
2013
 
2012
  
2011
 
Dividend yield
None
 
None
 
None
 
Average risk-free interest rate
  
1.1
%
  
1.1
%
  
2.4
%
Stock price volatility
  
34
%
  
33
%
  
33
%
Estimated option term
Six years or
seven years
 
Six years or
seven years
 
Six years or
seven years