Other Income, Net (Tables)

6 Months Ended

Jun. 30, 2013

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Thousands of Dollars)	2013			2012			2013			2012
Interest income	$	1,505		$	881		$	6,311		$	6,503
Other nonoperating income	534			1,157			1,755			2,079
Insurance policy expense	(1,407		)	(1,061		)	(3,546		)	(3,860		)
Other nonoperating expense	(219		)	(249		)	(185		)	(257		)
Other income, net	$	413		$	728		$	4,335		$	4,465