Other Income, Net (Tables)

3 Months Ended

Mar. 31, 2016

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended March 31
(Thousands of Dollars)	2016			2015
Interest income	$	3,336		$	3,332
Other nonoperating income	164			33
Insurance policy expense	(640		)	(1,403		)
Other income, net	$	2,860		$	1,962