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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of restricted stock activity
The following table summarizes the restricted stock activity under the Company's equity incentive plans :

 
Number
of
Shares
 
Weighted
Average
Fair Value
Per Share
Nonvested at January 1, 2012
452,567

 
$
7.09

Granted
36,640

 
$
6.55

Vested
(171,988
)
 
$
8.14

Forfeited/repurchased shares
—

 
$
—

Nonvested at December 31, 2012
317,219

 
$
6.46

Granted
24,824

 
$
11.28

Vested
(124,998
)
 
$
7.17

Forfeited/repurchased shares
—

 
$
—

Nonvested at December 31, 2013
217,045

 
$
6.60

Granted
115,726

 
$
11.35

Vested
(96,908
)
 
$
7.35

Forfeited/repurchased shares
—

 
$
—

Nonvested at December 31, 2014
235,863

 
$
8.63
Schedule of stock options activity
The following table summarizes the stock option activity under the Company's equity incentive plans:

 
Number
of
Shares
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted
Average
Contractual
Life
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2012
2,128,904

 
$
9.42

 
 
 
 

Granted
262,051

 
$
6.56

 
 
 
 

Exercised
(56,658
)
 
$
5.27

 
 
 
 

Forfeited
(50,512
)
 
$
7.99

 
 
 
 

Outstanding at December 31, 2012
2,283,785

 
$
9.23

 
 
 
 

Granted
35,081

 
$
9.48

 
 
 
 

Exercised
(155,731
)
 
$
5.51

 
 
 
 

Forfeited
(91,378
)
 
$
9.82

 
 
 
 

Outstanding at December 31, 2013
2,071,757

 
$
9.49

 
 
 
 

Granted
233,828

 
$
11.35

 
 
 
 

Exercised
(143,282
)
 
$
6.08

 
 
 
 

Forfeited
(105,405
)
 
$
11.06

 
 
 
 

Outstanding at December 31, 2014
2,056,898

 
$
9.86

 
 
 
 

 
 
 
 
 
 
 
 
Vested at December 31, 2014 and expected to vest
2,031,492

 
$
9.87

 
5.81
 
$
5,360

Exercisable at December 31, 2014
1,461,837

 
$
10.50

 
4.96
 
$
3,681
Schedule of stock option valuation assumptions
The Company calculates the fair value of each option on the date of grant using the Black-Scholes pricing model and the following weighted-average assumptions in each year:
 
2014
 
2013
 
2012
Weighted average grant-date fair value of options granted
$
6.40

 
$
4.11

 
$
4.08

Risk-free interest rate
1
%
 
1
%
 
1.42
%
Expected volatility
88.5
%
 
62.4
%
 
68.5
%
Expected term of options (in years)
3.0

 
3.2

 
6.2

Dividend yield
—
%
 
—
%
 
—
%
Schedule of intrinsic value of options exercised and fair value of shares vested
 
2014
 
2013
 
2012
Total intrinsic value of options exercised
$
494

 
$
804

 
$
130

Total fair value of shares vested
$
923

 
$
1,457

 
$
1,997