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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2016
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic pension income:
 
Three Months Ended September 30,
(in thousands)
2016
 
2015
Service cost
$
733

 
$
1,163

Interest cost
7,809

 
9,485

Expected return on plan assets
(14,757
)
 
(14,709
)
Amortization of transition obligation
23

 
21

Amortization of prior service credit
(113
)
 
(104
)
Recognition of actuarial losses
2,112

 
1,833

Special termination benefit charge
—

 
54

Net periodic pension income
$
(4,193
)
 
$
(2,257
)
Other Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic other postretirement benefit cost:
 
Three Months Ended September 30,
(in thousands)
2016
 
2015
Interest cost
$
168

 
$
210

Amortization of prior service credit
(6
)
 
(6
)
Recognition of actuarial loss
89

 
81

Net periodic other postretirement benefit cost
$
251

 
$
285