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Equity Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 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
shares
 
Option price
per share
 
Weighted avg.
exercise price
Outstanding at December 31, 2015
516,305

 
$
19.02

 
—

 
$
65.50

 
$
48.42

Exercised
(230,319
)
 
19.41

 
—

 
65.50

 
44.05

Outstanding at December 31, 2016
285,986

 
$
19.02

 
—

 
$
61.79

 
$
51.93

Exercised
(29,253
)
 
46.86

 
—

 
61.79

 
54.54

Granted
2,215

 
76.63

 
—

 
76.63

 
76.63

Forfeited/Expired
(1,342
)
 
51.64

 
—

 
61.79

 
59.52

Outstanding at December 31, 2017
257,606

 
$
19.02

 
—

 
$
76.63

 
$
51.81

Exercised
(25,721
)
 
45.20

 
—

 
61.79

 
50.68

Granted
3,835

 
56.94

 
—

 
56.94

 
56.94

Forfeited/Expired
(845
)
 
51.64

 
—

 
61.79

 
61.12

Outstanding at December 31, 2018
234,875

 
$
19.02

 
—

 
$
76.63

 
$
51.98
Schedule of Stock Option Expense to be Recognized in the Future
At December 31, 2018, stock-option expense to be recognized in future periods was as follows (in thousands):
 
Amount
Year:
 
2019
$
7

2020
7

2021
3

Total
$
17
Summary Of Outstanding Options
The following table summarizes outstanding options at December 31, 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

 
0.4

 
 
 
 
20.00 - 29.99
—

 
—

 
 
 
 
30.00 - 39.99
1,428

 
1.0

 
 
 
 
40.00 - 49.99
72,342

 
3.1

 
 
 
 
50.00 - 59.99
71,868

 
5.2

 
 
 
 
60.00 - 69.99
75,925

 
6.1

 
 
 
 
70.00 - 76.63
2,215

 
8.1

 
 
 
 
 
234,875

 
4.6

 
$
51.98

 
$
2,857
Summary Of Exercisable Options
The following table summarizes exercisable options at December 31, 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

 
0.4

 
 
 
 
20.00 - 29.99
—

 
—

 
 
 
 
30.00 - 39.99
1,428

 
1.0

 
 
 
 
40.00 - 49.99
72,342

 
3.1

 
 
 
 
50.00 - 59.99
68,033

 
5.0

 
 
 
 
60.00 - 61.79
55,387

 
6.1

 
 
 
 
70.00 - 76.63
554

 
8.1

 
 
 
 
 
208,841

 
4.4

 
$
50.73

 
$
2,784
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
(15,416
)
 
64.39

 
 
Outstanding at December 31, 2018
655,056

 
$
64.16

 
0.78
Nonvested Shares Unamortized Share-based Compensation Expense to be Recognized in the Future
At December 31, 2018, unamortized share-based compensation expense related to nonvested shares was $16.6 million and will be recognized in future periods as follows (in thousands):
 
Amount
Year:
 
2019
$
8,609

2020
5,570

2021
2,436

Total
$
16,615
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
Average
Grant Date
Fair Value
 
Weighted
Average
Life
Remaining
Outstanding at December 31, 2017
19,030

 
$
70.91

 
 
Granted
23,571

 
61.25

 
 
Vested
(19,030
)
 
70.91

 
 
Outstanding at December 31, 2018
23,571

 
$
61.25

 
0.42