XML 33 R21.htm IDEA: XBRL DOCUMENT v3.7.0.1
Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2017
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)
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
 
Service cost
 
$
1,311

  
$
1,361

 
$
64

  
$
73

Interest cost
 
2,434

  
2,469

 
383

  
375

Expected return on plan assets
 
(3,717
)
  
(3,589
)
 
(22
)
  
(11
)
Net amortization and deferral
 
815

  
838

 
(71
)
  
(100
)
Net periodic benefit cost
 
$
843

 
$
1,079

 
$
354

 
$
337