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

Other income, net consisted of the following:
 
Three Months Ended Sept. 30
 
Nine Months Ended Sept. 30
(Thousands of Dollars)
2017
 
2016
 
2017
 
2016
Interest income
$
1,422

 
$
162

 
$
2,406

 
$
451

Other nonoperating income
193

 
511

 
4,940

 
1,594

Insurance policy expense
(79
)
 
(129
)
 
(261
)
 
(205
)
Other nonoperating expense

 

 

 
(3
)
Other income, net
$
1,536

 
$
544

 
$
7,085

 
$
1,837