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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Stock-based compensation [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table presents the Company's time-based and performance-based stock option activity for the current period:
 
Time-Based
 
Performance-Based
 
Options Outstanding
 
Weighted Average Exercise Price (in dollars per share)
 
Options Exercisable
 
Weighted Average Exercise Price (in dollars per share)
 
Options Outstanding
 
Weighted Average Exercise Price (in dollars per share)
 
Options Exercisable
 
Weighted Average Exercise Price (in dollars per share)
Balance, December 31, 2013
1,930,407

 
$
4.22

 
1,806,251

 
$
3.98

 
289,306

 
$
8.46

 
—

 
$
—

Granted
15,000

 
8.27

 
—

 
—

 
—

 
—

 
—

 
—

Vested
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Exercised
(391,389
)
 
3.10

 
(391,389
)
 
3.10

 
—

 
—

 
—

 
—

Canceled/forfeited
(74,176
)
 
7.90

 
(74,176
)
 
7.90

 
—

 
—

 
—

 
—

Balance, March 31, 2014
1,479,842

 
$
4.37

 
1,340,686

 
$
4.01

 
289,306

 
$
8.46

 
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average remaining contractual term at March 31, 2014 (in years)
3.8

 
 
 
3.3

 
 
 
8.5

 
 
 
—

 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table presents the weighted average assumptions used to estimate the fair values of all stock options granted during the three months ended March 31, 2014:
 
Assumptions
Expected term (years)
6.25

Expected volatility
33.83
%
Expected dividends
—
%
Risk-free rate
2.19
%
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table presents the Company's time-based and performance-based restricted stock award activity for the current period:
 
Time-Based
 
Performance-Based
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Shares outstanding at December 31, 2013
139,680

 
$
8.59

 
130,629

 
$
10.20

Grants
105,000

 
7.26

 
—

 
—

Vests
(45,000
)
 
8.51

 
—

 
—

Forfeitures
—

 
—

 
—

 
—

Shares outstanding at March 31, 2014
199,680

 
$
7.91

 
130,629

 
$
10.20
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table presents the total time-based and performance-based stock-based compensation expense and the related income tax benefit recognized on the Consolidated Statements of Income:
 
For the Three Months Ended March 31,
 
2014
 
2013
Personnel costs
$
160

 
$
185

Other operating expenses
132

 
118

Income tax benefit
(112
)
 
(116
)
Net stock-based compensation expense
$
180

 
$
187

Additional information on total non-vested stock-based compensation is as follows:
At March 31, 2014
 
Stock Options
 
Restricted Stock Awards
Unrecognized compensation cost related to non-vested awards
$
398

 
$
1,517

Weighted-average recognition period (in years)
3.2

 
3.6
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
Additional information on total non-vested stock-based compensation is as follows:
At March 31, 2014
 
Stock Options
 
Restricted Stock Awards
Unrecognized compensation cost related to non-vested awards
$
398

 
$
1,517

Weighted-average recognition period (in years)
3.2

 
3.6