Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2015

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net for the years ended Dec. 31 consisted of the following:

(Thousands of Dollars)	2015			2014			2013
Interest income	$	753		$	1,470		$	1,761
Other nonoperating income	2,408			3,601			2,603
Insurance policy expense	(197		)	(806		)	(1,228		)
Other income, net	$	2,964		$	4,265		$	3,136