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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of share option activity
A summary of share option activity under the 2011 Plan as of March 31, 2013 and changes during the three months ended March 31, 2013 is presented below:
 
Number
of Shares
 
Weighted-
Average
Exercise
Price ($)
 
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
($000)
Outstanding at December 31, 2012
247,650

 
9.59

 
8.0
 
2,015

Exercised
(45,450
)
 
9.87

 
 
 
 
Forfeited or expired
(56,250
)
 
12.15

 
 
 
 
Outstanding at March 31, 2013
145,950

 
8.52

 
7.5
 
2,457

Exercisable at March 31, 2013
61,450

 
7.99

 
7.4
 
1,067

Vested or Expected to Vest at March 31, 2013
143,817

 
8.51

 
7.5
 
2,423
Summary of the status of the Company's restricted stock shares
A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of March 31, 2013 and changes during the three months ended March 31, 2013 is presented below:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value ($)
Outstanding at December 31, 2012
449,629

 
16.93

Vested
(68,523
)
 
19.86

Forfeited
(12,094
)
 
19.97

Outstanding at March 31, 2013
369,012

 
16.30
Multiple input variables of performance share awards
The grant date fair value of the performance share awards was determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award as follows:
 
Weighted-Average at Grant Date
 
Expected volatility factor
0.39
 
Risk free interest rate
0.44
%
Expected term (in years)
2.72
 
Expected dividend yield
—
%
Performance share award activity
The following table summarizes the Company’s performance share awards for three months ended March 31, 2013:
 
Number of Awards
 
Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2012
280,907

 
20.30

Granted
—

 
—

Vested
—

 
—

Forfeited
(7,500
)
 
20.07

Outstanding at March 31, 2013
273,407

 
20.30