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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity Under the Plan
The following is a summary of stock option activity under the 2007 and 2006 Plans for the year ended 2015:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding - January 1, 2015
591,652

 
$
19.00

 
 
 
 
Expired
(103,801
)
 
18.48

 
 
 
 
Outstanding - December 31, 2015
487,851

 
$
19.07

 
2.38
 
$
298,699

Options exercisable - December 31, 2015
319,851

 
$
20.78

 
2.38
 
$
298,699

Summary of Restricted and Performance Unit Activity Under the Plan
The following is a summary of restricted and performance unit activity under the 2007 and 2006 Plans for the year ended 2015:

 
Number of
Shares
 
Weighted-
Average
Grant
Date Fair
Value
Outstanding - January 1, 2015
175,668

 
$
13.51

Granted
18,000

 
14.26

Vested
(62,742
)
 
12.50

Forfeited
(23,877
)
 
15.77

Outstanding - December 31, 2015
107,049

 
$
13.72

Estimated Annual Stock-Based Compensation Expense
The estimated annual stock-based compensation expense as of December 31, 2015 for each of the succeeding years is indicated in the table below:
 
 
Stock Based
Compensation Expense
 
(In thousands)
For the year ended December 31:
 
2016
$
561

2017
468

2018
449

2019
145

2020
16

Total
$
1,639