Other Income, Net (Tables)

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Other Income, Net

Other expense, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Thousands of Dollars)	2018			2017			2018			2017
Interest income	$	356		$	147		$	298		$	192
Other nonoperating income	1			1			3			—
Other nonoperating expense	—			—			—			(1		)
Insurance policy expense	(12		)	(12		)	(24		)	(24		)
Benefits non-service cost	(1,127		)	(749		)	(1,763		)	(1,498		)
Other expense, net	$	(782	)	$	(613	)	$	(1,486	)	$	(1,331	)