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Earnings Per Share (Tables)
 6 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
Three Months Ended December 31,
 
Six Months Ended December 31,
 
2013
 
2012
 
2013
 
2012
Net Income
$
53,982

 
$
40,505

 
$
103,770

 
$
82,981

Common share information:
 
 
 
 
 
 
 
Weighted average shares outstanding for basic earnings per share
85,450

 
86,084

 
85,372

 
86,097

Dilutive effect of stock options and restricted stock
536

 
555

 
548

 
525

Weighted average shares outstanding for diluted earnings per share
85,986

 
86,639

 
85,920

 
86,622

Basic earnings per share
$
0.63

 
$
0.47

 
$
1.22

 
$
0.96

Diluted earnings per share
$
0.63

 
$
0.47

 
$
1.21

 
$
0.96