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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Option Activity
 
 
Number
of Stock Options
 
Weighted-
Average
Exercise
Price Per Share
 
Weighted-Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2014
 
702,001

 
$
18.46

 
 
 
 
Granted
 
71,000

 
24.90

 
 
 
 
Exercised
 
(117,149
)
 
19.43

 
 
 
 
Expired
 
(8,387
)
 
22.79

 
 
 
 
Forfeited
 
(35,488
)
 
17.44

 
 
 
 
Outstanding at December 31, 2014
 
611,977

 
$
19.02

 
4.2
 
$
3,834

Exerciseable at December 31, 2014
 
288,412

 
$
18.61

 
3.2
 
$
1,925
Schedule of Nonvested Options Activity
Changes in nonvested stock options for the year ended December 31, 2014 were as follows:
 
 
Number of Stock Options
 
Weighted-
Average
Grant
Date Fair Value
 
Nonvested at January 1, 2014
 
456,251

 
$
8.24

 
     Granted
 
71,000

 
12.62

 
     Vested
 
(168,198
)
 
7.87

 
     Forfeited
 
(35,488
)
 
8.14

 
Nonvested at December 31, 2014
 
323,565

 
$
9.42

 
Schedule of Assumptions Used
The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2014, 2013, and 2012 were as follows:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Risk-free interest rate
 
1.67
%
 
1.44
%
 
0.59
%
Expected volatility
 
55.27
%
 
53.89
%
 
57.05
%
Expected dividends
 
—

 
—

 
—

Expected term (in months)
 
66

 
66

 
66
Schedule of Restricted Stock Units Activity
Restricted stock unit activity for the year ended December 31, 2014 was as follows:
 
 
Number of Restricted Stock Units
 
Weighted-
Average
Grant
Date Fair Value
 
Outstanding at January 1, 2014
 
93,358

 
$
17.79

 
     Granted
 
86,300

 
24.74

 
     Vested
 
(52,115
)
 
19.51

 
     Forfeited
 
(4,600
)
 
24.90

 
Outstanding at December 31, 2014
 
122,943

 
$
21.67

 
Schedule of Performance-based Units Activity
Performance stock activity for the year ended December 31, 2014 is as follows:
 
 
Number of Performance Stock Units
 
Weighted-
Average
Grant
Date Fair Value
 
Outstanding at January 1, 2014
 
152,972

 
$
15.44

 
     Granted
 
67,500

 
24.90

 
     Vested
 
(847
)
 
13.04

 
     Forfeited
 
(51,467
)
 
16.45

 
Outstanding at December 31, 2014
 
168,158

 
$
18.94