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Net Periodic Benefit Cost (Tables)
 9 Months Ended
Dec. 31, 2019
Pension Plans, Defined Benefiit  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs

The following table sets forth the components of net periodic pension cost for the Company’s defined benefit pension plans (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2019
 
December 31, 2018
Service costs
 
$
269

 
$
255

 
$
784

 
$
791

Interest cost
 
3,701

 
3,864

 
11,077

 
11,629

Expected return on plan assets
 
(3,971
)
 
(4,594
)
 
(11,917
)
 
(13,836
)
Net amortization
 
573

 
572

 
1,714

 
1,750

Net periodic pension (benefit) cost
 
$
572

 
$
97

 
$
1,658

 
$
334
Postemployment Retirement Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
The following table sets forth the components of net periodic postretirement benefit cost for the Company’s defined benefit postretirement plans (in thousands):
 
 
Three Months Ended
 
Nine Months Ended
 
 
December 31, 2019
 
December 31, 2018
 
December 31, 2019
 
December 31, 2018
Interest cost
 
$
14

 
$
28

 
$
53

 
$
85

Amortization of plan net losses
 
(74
)
 
(112
)
 
(154
)
 
(136
)
Net periodic postretirement (benefit) cost
 
$
(60
)
 
$
(84
)
 
$
(101
)
 
$
(51
)