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Benefit Plans (Tables)
 6 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Net periodic pension income
The table below summarizes the components of net periodic pension income:
 
Three Months Ended December 31,
 
Six Months Ended December 31,
(in thousands)
2014

 
2013

 
2014

 
2013

Service cost
$
1,384

 
$
1,732

 
$
2,799

 
$
3,448

Interest cost
9,745

 
10,308

 
19,681

 
20,484

Expected return on plan assets
(14,900
)
 
(14,916
)
 
(29,947
)
 
(29,712
)
Amortization of transition obligation
19

 
20

 
40

 
38

Amortization of prior service credit
(71
)
 
(58
)
 
(141
)
 
(117
)
Recognition of actuarial losses
937

 
670

 
1,937

 
1,312

Curtailment loss
358

 
—

 
358

 
—

Special termination benefit charge
459

 
—

 
459

 
—

Net periodic pension income
$
(2,069
)
 
$
(2,244
)
 
$
(4,814
)
 
$
(4,547
)
Net periodic other postretirement costs
The table below summarizes the components of the net periodic other postretirement benefit cost:
 
Three Months Ended December 31,
 
Six Months Ended December 31,
(in thousands)
2014

 
2013

 
2014

 
2013

Service cost
$
27

 
$
14

 
$
54

 
$
28

Interest cost
259

 
251

 
519

 
502

Amortization of prior service credit
(28
)
 
(28
)
 
(55
)
 
(56
)
Recognition of actuarial loss
207

 
79

 
414

 
158

Curtailment gain
(221
)
 
—

 
(221
)
 
—

Net periodic other postretirement benefit cost
$
244

 
$
316

 
$
711

 
$
632