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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of stock option plans activity
Additional information relating to the Company’s stock option plans follows:
 
2017
 
2016
 
2015
Options outstanding at beginning of year
91

 
169

 
298

Options exercised
(28
)
 
(78
)
 
(66
)
Options forfeited and expired
—

 
—

 
(63
)
Options outstanding at end of year
63

 
91

 
169

Options exercisable at end of year
63

 
90

 
164

Option prices per share:
 
 
 
 
 
Options exercised during the year
$ 57.34-66.14

 
28.37-93.65

 
28.37-93.65

Options forfeited and expired during the year
$
—

 
—

 
28.37-88.33

Options outstanding at end of year
$ 57.34-66.14

 
57.34-66.14

 
28.37-93.65

Options exercisable at end of year
$ 57.34-66.14

 
57.34-66.14

 
28.37-93.65
Summary of the stock options under the 2002, 2007 and 2012 plans
A summary of the Company’s options under the 2002, 2007 and 2012 Plans as of December 31, 2017, and changes during the year then ended is presented as follows:
 
Shares
 
Weighted
average
exercise
price
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic
value
Options outstanding, December 31, 2016
91

 
$
63.84

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(28
)
 
66.08

 
 
 
 
Forfeited and expired
—

 
—

 
 
 
 
Options outstanding, December 31, 2017
63

 
$
62.86

 
3.8
 
$
13,446

Vested and expected to vest as of December 31, 2017
63

 
$
62.86

 
3.8
 
$
13,446

Exercisable as of December 31, 2017
63

 
$
62.86

 
3.8
 
$
13,446
Summary of stock options outstanding
The following table summarizes information about the Company’s stock options outstanding as of December 31, 2017:
 
Outstanding
 
Exercisable
Exercise price range
Number of
shares
 
Average
life
 
Average
price
 
Number of
shares
 
Average
price
$57.34-$57.34
23

 
3.15
 
57.34

 
23

 
57.34

$66.14-$66.14
40

 
4.14
 
66.14

 
40

 
66.14

Total
63

 
3.77
 
$
63.84

 
63

 
$
63.82
Summary of RSUs under the 2007 and 2012 plans
A summary of the Company’s RSUs under the 2007 and 2012 Plans as of December 31, 2017, and changes during the year then ended is presented as follows:
 
Shares
 
Weighted
average grant date fair value
 
Weighted
average
remaining
contractual
term (years)
 
Aggregate
intrinsic value
Restricted Stock Units outstanding, December 31, 2016
695

 
$
113.51

 

 

Granted
154

 
226.91

 

 

Released
(284
)
 
106.30

 

 

Forfeited
(10
)
 
190.53

 

 

Restricted Stock Units outstanding, December 31, 2017
555

 
$
147.28

 
1.1
 
$
152,017

Expected to vest as of December 31, 2017
546

 


 
1.1
 
$
146,650
Additional information for RSUs under the 2007 and 2012 plans
Additional information relating to the Company’s RSUs under the 2007 and 2012 Plans is as follows:
 
2017
 
2016
 
2015
Restricted Stock Units outstanding, January 1
695

 
750

 
725

Granted
154

 
187

 
248

Released
(284
)
 
(226
)
 
(212
)
Forfeited
(10
)
 
(16
)
 
(11
)
Restricted Stock Units outstanding, December 31
555

 
695

 
750

Expected to vest as of December 31
546

 
682

 
731