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OTHER INCOME AND EXPENSE (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Other Expense Disclosure [Text Block]
OTHER INCOME AND OTHER EXPENSE

The following table sets forth the components of other income and other expense for the periods indicated:
 
 
Years Ended December 31,
 
 
 
2019
 
2018
 
2017
 
 
 
(Thousands of dollars)
Net periodic benefit cost other than service cost
 
$
(5,895
)
 
$
(8,824
)
 
$
(17,252
)
 
Other, net
 
2,919

 
(2,535
)
 
2,727

 
Total other expense, net
 
$
(2,976
)
 
$
(11,359
)
 
$
(14,525
)