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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2018
Defined Benefit Plan [Abstract]  
Components of Company's Net Periodic Benefit Cost
The components of the Company’s net periodic benefit cost were as follows:
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
 
Other Postretirement Benefits
 
 
Three Months Ended June 30,
 
Three Months Ended June 30,
(in thousands of dollars)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,455

  
$
1,311

 
$
59

  
$
64

Interest cost
 
2,481

  
2,434

 
340

  
383

Expected return on plan assets
 
(3,694
)
  
(3,717
)
 
(25
)
  
(22
)
Net amortization and deferral
 
902

  
815

 
(194
)
  
(71
)
Net periodic benefit cost
 
$
1,144

 
$
843

 
$
180

 
$
354