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Net Periodic Benefit Cost (Tables)
 6 Months Ended
Sep. 30, 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
 
Six Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
Service costs
 
$
248

 
$
267

 
$
515

 
$
536

Interest cost
 
3,676

 
3,880

 
7,375

 
7,765

Expected return on plan assets
 
(3,972
)
 
(4,605
)
 
(7,945
)
 
(9,242
)
Net amortization
 
571

 
589

 
1,140

 
1,178

Net periodic pension (benefit) cost
 
$
523

 
$
131

 
$
1,085

 
$
237
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
 
Six Months Ended
 
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
Interest cost
 
$
20

 
$
28

 
$
40

 
$
57

Amortization of plan net losses
 
(40
)
 
(12
)
 
(80
)
 
(24
)
Net periodic postretirement (benefit) cost
 
$
(20
)
 
$
16

 
$
(40
)
 
$
33