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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
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 Plan and 2016 Plan for the three months ended March 31, 2017:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
(Dollars in thousands)
Outstanding - January 1, 2017
1,624,227

 
$
15.30

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(21,307
)
 
11.07

 
 
 
 
Expired
(1,530
)
 
15.34

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding - March 31, 2017
1,601,390

 
$
15.36

 
6.40
 
$
6,861

Options exercisable - March 31, 2017
866,548

 
$
14.02

 
4.13
 
$
5,218
Summary of Restricted and Performance Unit Activity Under the Plan
The following is a summary of restricted stock and performance unit activity under the 2007 Plan and 2016 Plan for the three months ended March 31, 2017:
 
 
Number of
Shares
 
Weighted-
Average Grant Date
Fair Value
Outstanding - January 1, 2017
403,658

 
$
16.17

Granted
—

 
—

Vested
(36,407
)
 
15.31

Forfeited
(3,372
)
 
14.75

Outstanding - March 31, 2017
363,879

 
$
16.27