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	$	368		$	538		$	736
Other nonoperating income	321			152			129
Insurance policy expense	(409		)	(427		)	(389		)
Other nonoperating expense	(10		)	(10		)	—
Other income, net	$	270		$	253		$	476