Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Components of Long-term Debt

The components of long-term debt as of December 31 are as follows:

	2014		2013
	(Thousands of dollars)
Senior Notes issued March 17, 2014, interest only payable semi-annually at 5.25%, maturing March 15, 2019	$	500,000	$	—
Senior Notes issued September 23, 2010, interest only payable semi-annually at 8.625% maturing October 15, 2018		—		300,000
Revolving Credit Facility due October 1, 2016 with a group of commercial banks, interest payable at variable rates		43,000		79,000
Total long-term debt	$	543,000	$	379,000

Summary of Annual Maturities of Long-term Debt

Annual maturities of long-term debt for each of the five years following December 31, 2014 and in total thereafter follow (in thousands):

2015	$	—
2016		43,000
2017		—
2018		—
2019		500,000
Thereafter		—
Total	$	543,000