Other Income, Net (Tables)

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

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	$	296		$	400		$	488		$	579
Other nonoperating income	1			—			—			16
Insurance policy expense	(12		)	(32		)	(36		)	(32		)
Other nonoperating expense	—			(231		)	—			—
Other income, net	$	285		$	137		$	452		$	563