Long Term Debt (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Components of Long-term Debt

The components of long-term debt as of the dates indicated below were as follows:

	March 31,		December 31,
	2015		2014
	(Thousands of dollars)
Senior Notes dated March 17, 2014, interest only payable semi-annually at 5.25%, maturing March 15, 2019	$	500,000	$	500,000
Revolving Credit Facility due October 1, 2016 with a group of commercial banks, interest payable at variable rates		39,640		43,000
Total long-term debt	$	539,640	$	543,000