Other Income, Net (Tables)

3 Months Ended

Mar. 31, 2017

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended March 31
(Thousands of Dollars)	2017			2016
Interest income	$	375		$	141
Other nonoperating income	3,431			333
Insurance policy expense	(79		)	(25		)
Other nonoperating expense	(10		)	—
Other income, net	$	3,717		$	449