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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2017
STOCKHOLDERS' EQUITY [Abstract]  
Effect of Compensation Cost on Earnings
The Company’s results for the years ended December 31, 2017, 2016 and 2015 reflected the following compensation cost and such compensation cost had the following effects on net earnings:

  
Increase/(Decrease) for the
Years Ended December 31,
 
  
2017
  
2016
  
2015
 
Cost of sales
 
$
524
  
$
1,040
  
$
854
 
Operating expenses
  
5,736
   
5,984
   
5,975
 
Net earnings
  
(3,990
)
  
(4,473
)
  
(4,395
)
Assumptions used in the Valuation of Option Awards
The fair value of each option award issued under the Company’s stock plans is estimated on the date of grant using a Black-Scholes based option-pricing model that uses the assumptions noted in the following table. Expected volatilities are based on historical volatility of the Company’s stock. The expected term of the options is based on the Company’s historical experience of employees’ exercise behavior. Dividend yields are based on the Company’s historical dividend yields. Risk-free interest rates are based on the implied yields currently available on U.S. Treasury zero coupon issues with a remaining term equal to the expected life.

  
Years Ended
 
 
Weighted Average Assumptions:
 
2017
  
December 31,
2016
  
2015
 
Expected Volatility
  
30.1
%
  
34.4
%
  
33.2
%
Expected Term (in years)
  
4.6
   
5.0
   
5.5
 
Risk-Free Interest Rate
  
1.8
%
  
1.2
%
  
1.7
%
Dividend Yield
  
0.5
%
  
0.5
%
  
0.6
%
Summary of Stock Option Activity
A summary of stock option plan activity for 2017, 2016, and 2015 for all plans is as follows:

 
2017
 
# of
Shares
(000s)
  
Weighted Average
Exercise Price
 
Outstanding at beginning of year
  
1,066
  
$
45.32
 
Granted
  
222
   
85.22
 
Exercised
  
(268
)
  
36.36
 
Forfeited
  
(52
)
  
72.29
 
Cancelled
  
(22
)
  
57.48
 
Outstanding at end of year
  
946
  
$
55.44
 
Exercisable at end of year
  
493
  
$
41.01
 

 
2016
 
# of
Shares
(000s)
  
Weighted Average
Exercise Price
 
Outstanding at beginning of year
  
1,017
  
$
37.29
 
Granted
  
341
   
60.92
 
Exercised
  
(236
)
  
30.44
 
Forfeited
  
(56
)
  
58.23
 
Outstanding at end of year
  
1,066
  
$
45.32
 
Exercisable at end of year
  
604
  
$
34.77
 

 
2015
 
# of
Shares
(000s)
  
Weighted Average
Exercise Price
 
Outstanding at beginning of year
  
1,470
  
$
27.35
 
Granted
  
209
   
58.34
 
Exercised
  
(627
)
  
20.16
 
Forfeited
  
(35
)
  
52.97
 
Outstanding at end of year
  
1,017
  
$
37.29
 
Exercisable at end of year
  
667
  
$
29.19
 
Other Information Pertaining to Stock Option Activity
Other information pertaining to option activity during the years ended December 31, 2017, 2016 and 2015 was as follows:
 
 
Years Ended December 31,
 
 
2017
 
2016
 
2015
 
Weighted-average fair value of options granted
 
$
23.20
  
$
18.48
  
$
18.35
 
Total intrinsic value of stock options exercised ($000s)
 
$
11,900
  
$
8,609
  
$
24,047
 
Additional Information Relating to Stock Options Outstanding
Additional information related to stock options outstanding under all plans at December 31, 2017 is as follows:
 
     
Options Outstanding
  
Options Exercisable
 
Range of Exercise
Prices
  
Shares
Outstanding
(000s)
 
Weighted
Average
Remaining
Contractual
 Term
 
Weighted
Average
 Exercise
Price
  
Number
Exercisable
(000s)
  
Weighted
Average
Exercise
Price
 
$
13.61 - $34.81
   
209
 
2.6 years
 
$
25.79
   
208
  
$
25.79
 
 
38.10 - 59.95
   
278
 
5.6 years
  
51.34
   
219
   
49.47
 
 
60.01 - 85.40
   
459
 
8.0 years
  
71.37
   
66
   
60.99
 
     
946
 
6.3 years
 
$
55.44
   
493
  
$
41.01
 
Non-vested Restricted Stock Activity
Non-vested restricted stock activity for the years ended December 31, 2017, 2016 and 2015 is summarized below:

  
Shares (000s)
  
Weighted
Average Grant
Date Fair
Value
 
Non-vested balance as of December 31, 2016
  
102
  
$
54.18
 
Granted
  
21
   
83.43
 
Vested
  
(53
)
  
51.39
 
Forfeited
  
(4
)
  
55.45
 
Non-vested balance as of December 31, 2017
  
66
  
$
65.66
 

  
Shares (000s)
  
Weighted
Average Grant
Date Fair
Value
 
Non-vested balance as of December 31, 2015
  
150
  
$
47.46
 
Granted
  
19
   
61.22
 
Vested
  
(66
)
  
40.96
 
Forfeited
  
(1
)
  
56.77
 
Non-vested balance as of December 31, 2016
  
102
  
$
54.18
 

  
Shares (000s)
  
Weighted
Average Grant
Date Fair
 Value
 
Non-vested balance as of December 31, 2014
  
134
  
$
38.13
 
Granted
  
77
   
55.77
 
Vested
  
(61
)
  
37.35
 
Forfeited
  
-
   
-
 
Non-vested balance as of December 31, 2015
  
150
  
$
47.46
 
Non-vested Performance Share Activity
Non-vested performance share activity for the years ended December 31, 2017, 2016 and 2015 is summarized below:
 
  
Shares (000s)
  
Weighted
Average Grant
Date Fair
Value
 
Non-vested balance as of December 31, 2016
  
34
  
$
61.06
 
Granted
  
16
   
93.85
 
Vested
  
-
   
-
 
Forfeited
  
(11
)
  
69.25
 
Non-vested balance as of December 31, 2017
  
39
  
$
72.62
 

  
Shares (000s)
  
Weighted
Average Grant
Date Fair
Value
 
Non-vested balance as of December 31, 2015
  
20
  
$
58.77
 
Granted
  
22
   
63.15
 
Vested
  
-
   
-
 
Forfeited
  
(8
)
  
60.88
 
Non-vested balance as of December 31, 2016
  
34
  
$
61.06
 

  
Shares (000s)
  
Weighted
Average Grant
Date Fair
Value
 
Non-vested balance as of December 31, 2014
  
-
  
$
-
 
Granted
  
29
   
58.77
 
Vested
  
-
   
-
 
Forfeited
  
(9
)
  
58.77
 
Non-vested balance as of December 31, 2015
  
20
  
$
58.77