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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2012
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 September 30, 2012 and changes during the nine months ended September 30, 2012 are presented below:
 
Number
of Shares
 
Weighted-
Average
Exercise
Price ($)
 
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
($000)
Outstanding at December 31, 2011
312,000

 
9.33

 
8.9

 
1,946

Granted
—

 
—

 
 
 
 
Exercised
(50,225
)
 
8.22

 
 
 
 
Forfeited or expired
(5,875
)
 
9.44

 
 
 
 
Outstanding at September 30, 2012
255,900

 
9.55

 
8.2

 
1,927

Exercisable at September 30, 2012
74,900

 
9.14

 
8.0

 
595

Vested or expected to vest at September 30, 2012
245,168

 
9.52

 
8.2

 
1,854
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 September 30, 2012, and changes during the nine months ended September 30, 2012:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value ($)
Outstanding at December 31, 2011
271,999

 
1.43

Granted
377,942

 
20.15

Vested
(178,395
)
 
2.90

Forfeited
(15,125
)
 
3.79

Outstanding at September 30, 2012
456,421

 
16.28
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
0.45

%
Expected term (in years)
2.73

 
Expected dividend yield
—

%
Performance share award activity
The following table summarizes the Company’s performance share awards for the nine months ended September 30, 2012:
 
Number of Awards
 
Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2011
—

 
—

Granted
275,000

 
32.12

Vested
—

 
—

Forfeited
—

 
—

Outstanding at September 30, 2012
275,000

 
32.12