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Equity Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Recognized compensation expenses
The Company recognized compensation expense related to the Company plans for the years ended December 31, 2017, 2016 and 2015 as follows (in thousands):
 
 
 
2017
 
2016
 
2015
Stock option plan expense
 
$
1,305

 
$
538

 
$
727

Restricted stock expense
 
$
18,539

 
$
12,235

 
$
10,982
Summary of the activity of stock option awards
A summary of the activity of the Company’s stock options plans is presented below:
 
 
 
Shares
 
Wtd. Avg.
Exercise
Price
 
Wtd. Avg.
Remaining
Contractual Term (years)
 
Aggregate
Intrinsic
Value
 
 
(In thousands)
 
 
 
 
 
(In thousands)
Options outstanding at December 31, 2016
 
1,211

 
$
20.65

 
7.14
 
$
5,466

Granted
 
462

 
32.30

 
 
 
 
Exercised
 
(360
)
 
19.11

 
 
 
 
Forfeited/Canceled
 
(83
)
 
27.41

 
 
 
 
Options outstanding at December 31, 2017
 
1,230

 
$
25.02

 
7.33
 
$
3,117

Options vested and expected to vest at December 31, 2017
 
1,165

 
$
24.84

 
7.25
 
$
3,042

Options exercisable at December 31, 2017
 
523

 
$
22.04

 
5.93
 
$
2,174


The aggregate intrinsic value in the table above represents the total pretax intrinsic value (i.e., the difference between the Company’s closing stock price on the last trading day of fiscal year 2017 and the exercise price, times the number of shares that are “in the money”) that would have been received by the option holders had all option holders exercised their options on December 31, 2017. This amount changes based on the fair value of the Company’s stock.
The following table summarizes information relative to stock option activity during the years ended December 31, 2017, 2016 and 2015 (in thousands):
 
 
 
2017
 
2016
 
2015
Intrinsic value of options exercised
 
$
4,126

 
$
1,671

 
$
2,000

Fair value of shares vested
 
$
373

 
$
518

 
$
1,314
Exercise prices and related information of stock option outstanding
The following table summarizes information about the exercise prices and related information of stock options outstanding under the Company plans at December 31, 2017:
 
 
 
Options Outstanding
 
Options Exercisable
Exercise Prices
 
Number
Outstanding
 
Wtd. Avg.
Remaining
Contractual
Life
 
Wtd.  Avg.
Exercise
Price
 
Number
Exercisable
 
Wtd. Avg.
Remaining
Contractual
Life
 
Wtd.  Avg.
Exercise
Price
 
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
0-18.23
 
185

 
3.22
 
$
13.97

 
185

 
3.22
 
$
13.97

18.24-22.26
 
392

 
7.52
 
$
20.18

 
133

 
6.92
 
$
20.62

22.27-29.39
 
233

 
7.02
 
$
28.77

 
120

 
6.87
 
$
28.77

29.40-43.15
 
420

 
9.12
 
$
32.27

 
85

 
8.94
 
$
32.27

Total
 
1,230

 
7.33
 
$
25.02

 
523

 
5.93
 
$
22.04
Status of non - vested stock options
The following table summarizes the status of non-vested stock options as of December 31, 2017 and 2016, and changes during the year ending December 31, 2017:
 
 
 
Number of Shares
 
Wtd. Avg. Grant
Date Fair Value
 
 
(In thousands)
 
 
Options non-vested at December 31, 2016
 
590

 
$
1.93

Granted
 
462

 
5.91

Vested
 
(262
)
 
2.01

Forfeited
 
(83
)
 
3.87

Options non-vested at December 31, 2017
 
707

 
$
3.93
Summary of the activity of restricted stock
The following table summarizes the status of restricted stock awards as of December 31, 2017 and 2016, and changes during the year ended December 31, 2017:
 
 
 
Shares
 
Wtd. Avg.
Grant  date
Fair value
 
 
(In thousands)
 
 
Restricted stock outstanding at December 31, 2016
 
1,345

 
$
24.37

Granted
 
933

 
35.31

Vested
 
(442
)
 
23.23

Forfeited/Canceled
 
(66
)
 
26.89

Restricted stock outstanding at December 31, 2017
 
1,770

 
$
30.47