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Equity Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2018
Share-based Compensation [Abstract]  
Summary Of Share Option Activity
A summary of the Company’s share option activity and related information is as follows:
 
 
Number of
options
 
Option price
per share
 
Weighted avg.
exercise price
Outstanding at December 31, 2017
257,606

 
$
19.02

 

 
$
76.63

 
$
51.81

Exercised
(5,742
)
 
45.20

 

 
61.79

 
52.42

Granted
3,835

 
56.94

 

 
56.94

 
56.94

Forfeited/Expired
(205
)
 
51.64

 

 
61.79

 
59.02

Outstanding at June 30, 2018
255,494

 
$
19.02

 

 
$
76.63

 
$
51.87

Summary Of Outstanding Options
The following table summarizes outstanding options at June 30, 2018:
Exercise price range
 
Options
outstanding
 
Weighted avg.
life remaining
 
Weighted avg.
exercise price
 
Aggregate intrinsic
value  (in thousands)
$ 19.02 - 19.99
 
11,097

 
0.9

 
 
 
 
20.00 - 29.99
 

 

 
 
 
 
30.00 - 39.99
 
1,428

 
1.5

 
 
 
 
40.00 - 49.99
 
84,509

 
3.6

 
 
 
 
50.00 - 59.99
 
76,474

 
5.7

 
 
 
 
60.00 - 69.99
 
79,771

 
6.6

 
 
 
 
70.00 - 76.63
 
2,215

 
8.7

 
 
 
 
 
 
255,494

 
5.1

 
$
51.87

 
$
3,328

Summary Of Exercisable Options
The following table summarizes exercisable options at June 30, 2018:
Exercise price range
 
Options
outstanding
 
Weighted avg.
life  remaining
 
Weighted avg.
exercise price
 
Aggregate  intrinsic
value (in thousands)
$ 19.02 - 19.99
 
11,097

 
0.9

 
 
 
 
20.00 - 29.99
 

 

 
 
 
 
30.00 - 39.99
 
1,428

 
1.5

 
 
 
 
40.00 - 49.99
 
84,509

 
3.6

 
 
 
 
50.00 - 59.99
 
72,639

 
5.5

 
 
 
 
60.00 - 69.99
 
58,593

 
6.6

 
 
 
 
70.00 - 76.63
 
554

 
8.7

 
 
 
 
 
 
228,820

 
4.8

 
$
50.68

 
$
3,234

Summary Of Nonvested Share Activity
A summary of the Company’s nonvested share activity and related information is as follows:
 
Number  of
shares
 
Weighted avg.
grant  date
fair value
 
Weighted avg.
life remaining
Outstanding at December 31, 2017
620,122

 
$
68.07

 
 
Granted
295,202

 
56.94

 
 
Vested
(244,852
)
 
65.33

 
 
Forfeited
(38
)
 
56.94

 
 
Outstanding at June 30, 2018
670,434

 
$
64.17

 
1.40
Summary Of Restricted Share Unit Activity
A summary of the Company’s restricted share unit activity and related information is as follows:
 
Number  of
shares
 
Weighted avg.
grant date
fair value
 
Weighted avg.
life remaining
Outstanding at December 31, 2017
19,030

 
$
70.91

 
 
Granted
23,571

 
61.25

 
 
Vested
(19,030
)
 
70.91

 
 
Outstanding at June 30, 2018
23,571

 
$
61.25

 
0.92