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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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)
 
2016
 
2015
 
2016
 
2015
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,361

  
$
1,483

 
$
73

  
$
108

Interest cost
 
2,469

  
2,346

 
375

  
407

Expected return on plan assets
 
(3,589
)
  
(3,576
)
 
(11
)
  
(15
)
Net amortization and deferral
 
838

  
1,199

 
(100
)
  
(44
)
Net periodic benefit cost
 
$
1,079

 
$
1,452

 
$
337

 
$
456