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Other Income, Net
 9 Months Ended
Sep. 30, 2017
Other Income and Expenses [Abstract]  
Other Income, Net
Other Income (Expense), Net

Other income (expense), net consisted of the following:
 
 
Three Months Ended Sept. 30
 
Nine Months Ended Sept. 30
(Thousands of Dollars)
 
2017
 
2016
 
2017
 
2016
Interest income (expense)
 
$
138

 
$
(73
)
 
$
342

 
$
65

Other nonoperating income
 
8

 
33

 
238

 
299

Insurance policy (expense) income
 
(48
)
 
(58
)
 
(146
)
 
70

Other nonoperating expense
 
(3
)
 
(4
)
 
(10
)
 
(10
)
Other income (expense), net
 
$
95

 
$
(102
)
 
$
424

 
$
424