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Stock Based Compensation (Tables)
 3 Months Ended
Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
2005 NSOP & 1996 SOP – Stock options
 
 
 
 
 
 
Number of
 Shares
 
Weighted
 Average
 Exercise
 Price
 
Aggregate
 Intrinsic
 Value
Outstanding July 1, 2012
464

 
$
16.19

 
 
Granted
—

 
—

 
 
Forfeited
—

 
—

 
 
Exercised
(141
)
 
14.63

 
 
Outstanding September 30, 2012
323

 
$
16.86

 
$
6,780

Vested September 30, 2012
323

 
$
16.86

 
$
6,780

Exercisable September 30, 2012
323

 
$
16.86

 
$
6,780
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Unit awards
Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding July 1, 2012
672

 
18.05

Granted
174

 
42.39

Vested
—

 
—

Forfeited
—

 
—

Outstanding September 30, 2012
846

 
$
23.05
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Volatility
23.3
%
Risk free interest rate
0.33
%
Dividend yield
1.2
%
Stock Beta
0.864
Schedule of Nonvested Restricted Stock Activity [Table Text Block]
Share awards
Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding July 1, 2012
332

 
$
23.13

Granted
18

 
33.81

Vested
(108
)
 
22.10

Forfeited
—

 
—

Outstanding September 30, 2012
242

 
$
24.33