Debt Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Debt Obligations [Abstract]

Summary of outstanding debt balances

The following is a summary of the Company's outstanding debt balances at December 31:

(Thousands of dollars)	2012			2011
Long-term notes payable	$	326,704		$	350,000
Less current portion of long-term debt		(26,250	)		(17,500	)
Long-term debt	$	300,454		$	332,500

Long-term debt scheduled maturities

Scheduled maturities of long-term debt in future years as of December 31, 2012 are as follows (in thousands of dollars):

2013	$	26,250
2014		52,500
2015		87,500
2016		160,454
Total	$	326,704