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Share-Based Compensation (Tables)
 3 Months Ended
Sep. 30, 2012
Share-Based Compensation [Abstract]  
Summary of Changes in Options Outstanding
During the three months ended September 30, 2012, share-based compensation awards consisted of the issuance of 13,188 nonqualified stock options and 4,468 restricted stock grants. A summary of the changes in options outstanding under the Stock Plan during the three months ended September 31, 2012 is presented below:
 
                        
Weighted-
     
                        
Average
     
                    
Weighted-
 
Remaining
   
Aggregate
               
Number of
  
Average
 
Contractual
   
Intrinsic
               
Options
  
Exercise Price
 
Term in Years
   
Value
Outstanding as of June 30, 2012
 
4,365,397
 
$
8.10
 
2.65
 
$
29,690
Granted
     
13,188
  
13.43
         
Exercised
     
(303,333)
  
4.05
         
Forfeited and expired
 
—
  
—
         
Outstanding as of September 30, 2012
 
4,075,252
 
$
8.41
 
2.46
 
$
32,163
                                
Exercisable as of September 30, 2012
 
3,298,066
 
$
6.06
 
2.11
   
32,108
Assumptions used to estimate fair value of stock option awards using the Black-Scholes model
The Company estimates the fair value of grants using the Black-Scholes option pricing model. The following assumptions were used to estimate the fair value of stock option awards for the three months ended and as of September 30, 2012:
 
               
2013
 
Risk-free interest rate
 
0.22 to 0.91%
 
Expected dividend yield
 
1.64
 
Expected volatility
 
47.00 to 60.30
 
Expected forfeiture rate
 
—
 
Expected term (years)
 
1.60 to 6.05