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Earnings Per Share (Tables)
 6 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
Three Months Ended
 
Six Months Ended
 
December 31,
 
December 31,
 
2012
 
2011
 
2012
 
2011
Net Income
$
40,505

 
$
38,525

 
$
82,981

 
$
74,999

Common share information:
 
 
 
 
 
 
 
Weighted average shares outstanding for basic earnings per share
86,084

 
86,572

 
86,097

 
86,488

Dilutive effect of stock options and restricted stock
555

 
799

 
525

 
765

Weighted average shares outstanding for diluted earnings per share
86,639

 
87,371

 
86,622

 
87,253

Basic earnings per share
$
0.47

 
$
0.45

 
$
0.96

 
$
0.87

Diluted earnings per share
$
0.47

 
$
0.44

 
$
0.96

 
$
0.86