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Other Income, Net
6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Other Income, Net
Other Expense, Net

Other expense, net consisted of the following:
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(Thousands of Dollars)
 
2018
 
2017
 
2018
 
2017
Interest (expense) income
 
$
(15
)
 
$
61

 
$
141

 
$
204

Other nonoperating income
 
42

 
75

 
48

 
230

Other nonoperating expense
 
(3
)
 
(4
)
 
(7
)
 
(7
)
Insurance policy expense
 
(47
)
 
(49
)
 
(94
)
 
(98
)
Benefits non-service cost
 
(486
)
 
(678
)
 
(957
)
 
(1,356
)
Other expense, net
 
$
(509
)
 
$
(595
)
 
$
(869
)
 
$
(1,027
)