Other Income, Net (Tables)

12 Months Ended

Dec. 31, 2013

Other Income and Expenses [Abstract]

Other Income, Net

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

(Thousands of Dollars)	2013			2012			2011
Interest income	$	1,761		$	3,603		$	4,860
Other nonoperating income	2,603			2,233			2,512
Insurance policy expense	(1,228		)	(1,100		)	(359		)
Other nonoperating expense	—			—			(12		)
Other income, net	$	3,136		$	4,736		$	7,001