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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
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 2013:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding - January 1, 2013
797,805

 
$
16.70

 
 
 
 
Exercised
(286,242
)
 
9.96

 
 
 
 
Expired
(39,267)

 
15.81

 
 
 
 
Forfeited
(51,702)

 
8.64

 
 
 
 
Outstanding - December 31, 2013
420,594

 
$
19.14

 
2.57
 
$
552,242

Options exercisable - December 31, 2013
420,594

 
$
19.14

 
2.57
 
$
552,242
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 2013:
 
 
Number of
Shares
 
Weighted-
Average
Grant
Date Fair
Value
Outstanding - January 1, 2013
512,183

 
$
9.78

Granted
86,000

 
13.97

Vested
(310,658
)
 
10.16

Forfeited
(87,360
)
 
10.77

Outstanding - December 31, 2013
200,165

 
$
11.57
Estimated Annual Stock-Based Compensation Expense
The estimated annual stock-based compensation expense as of December 31, 2013 for each of the succeeding years is indicated in the table below:
 
 
Stock Based
Compensation Expense
 
(In thousands)
 
 
For the year ended December 31:
 
2014
$
1,006

2015
415

2016
185

2017
77

2018
—

Total
$
1,683