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Other Income (Expense), Net (Tables)
 3 Months Ended
Mar. 31, 2016
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other income (expense), net consisted of the following:
 
 
Three Months Ended March 31
(Thousands of Dollars)
 
2016
 
2015
Interest income
 
$
85

 
$
32

Other nonoperating (expense) income
 
(51
)
 
45

Insurance policy expense
 
—

 
(133
)
Other income (expense), net
 
$
34

 
$
(56
)