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Other Income, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other Income, Net
Other income, net for the years ended Dec. 31 consisted of the following:
(Thousands of Dollars)
 
2017
 
2016
 
2015
Interest income
 
$
716

 
$
244

 
$
332

Other nonoperating income
 
325

 
208

 
789

Insurance policy (expense) income
 
(195
)
 
22

 
(228
)
Other nonoperating expense
 
(13
)
 
(13
)
 
(10
)
Other income, net
 
$
833

 
$
461

 
$
883