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Defined Benefit Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit (income) costs relating to pension and other postretirement benefit plans
The components of net periodic benefit (income) costs relating to the Company’s pension and other postretirement benefit plans are as follows for the quarters ended June 30, 2018 and 2017 (amounts in thousands):
 
Pension
 
Other Benefits
 
Quarters Ended June 30,
 
Quarters Ended June 30,
 
2018
 
2017
 
2018
 
2017
Net service cost 
$
1,233

 
$
1,321

 
$
—

 
$
—

Interest cost
478

 
426

 
3

 
3

Expected return on net assets
(531
)
 
(505
)
 
—

 
—

Amortization:
 

 
 

 
 

 
 

Actuarial (gain) loss
107

 
90

 
(39
)
 
(47
)
Prior service cost
23

 
20

 
—

 
—

Total net periodic benefit (income) costs
$
1,310

 
$
1,352

 
$
(36
)
 
$
(44
)

All of the amounts in the table above, other than service cost, were recorded in the line item "Other (income) expense, net" in our Condensed Consolidated Statements of Operations.