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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Dec. 31, 2018
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 December 31,
 
Six Months Ended December 31,
(in thousands)
2018
 
2017
 
2018
 
2017
Service cost
$
407

 
$
406

 
$
818

 
$
810

Interest cost
7,970

 
7,678

 
15,960

 
15,335

Expected return on plan assets
(13,434
)
 
(14,132
)
 
(26,896
)
 
(28,221
)
Amortization of transition obligation
23

 
23

 
45

 
46

Amortization of prior service (credit) cost
(5
)
 
(41
)
 
(10
)
 
132

Recognition of actuarial losses
1,679

 
1,718

 
3,374

 
3,428

Net periodic pension income
$
(3,360
)
 
$
(4,348
)
 
$
(6,709
)
 
$
(8,470
)
Other Postretirement Benefits 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 December 31,
 
Six Months Ended December 31,
(in thousands)
2018
 
2017
 
2018
 
2017
Interest cost
$
153

 
$
157

 
$
307

 
$
314

Amortization of prior service credit
(22
)
 
(6
)
 
(45
)
 
(11
)
Recognition of actuarial loss
62

 
70

 
124

 
140

Net periodic other postretirement benefit cost
$
193

 
$
221

 
$
386

 
$
443