Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2014

Other Income and Expenses [Abstract]

Other Income, Net

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

(Thousands of Dollars)	2014			2013			2012
Interest income	$	1,470		$	1,761		$	3,603
Other nonoperating income	3,601			2,603			2,233
Insurance policy expense	(806		)	(1,228		)	(1,100		)
Other income, net	$	4,265		$	3,136		$	4,736