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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Net periodic costs
The following table provides summary disclosures of the net periodic postemployment costs recognized for the Company’s postemployment benefit plans:
 
 
Pension Benefits
 
Retiree Health Care
Benefits
Three Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
Components of net periodic cost:
 
 
 
 
 
 
 
 
Service cost
 
$
19

 
$
19

 
$
12

 
$
20

Interest cost
 
295

 
315

 
35

 
47

Expected return on plan assets
 
(104
)
 
(101
)
 
 
 
 
Recognized net actuarial loss (gain)
 
153

 
184

 
(9
)
 
(13
)
Amortization of prior service cost
 
20

 
21

 
(68
)
 
27

Net periodic cost
 
$
383

 
$
438

 
$
(30
)
 
$
81