Long-Term Debt and Commitments (Tables)

12 Months Ended

Dec. 31, 2012

Long-Term Debt and Commitments [Abstract]

Summary of long term debt

     The following is a summary of long term debt:

(thousands of dollars)			Dec. 31,2012	Dec. 31,2011
5.53% Series 2006A Senior Notes
	Due October 5, 2013		$    50,000	$    50,000
Floating Rate Series 2006A Senior Notes
	Due October 5, 2013 25,000		25,000	25,000
Variable/Fixed Rate Industrial
	Development Revenue Bonds Due August 1, 2012		--	8,000
Variable/Fixed Rate Industrial
	Development Revenue Bonds Series 1999 Due November 1, 2014		8,200	8,200
Installment obligations
	Due 2013		1,421	1,421
Other Borrowings
	Due 2014		834	1,380
		Total	85,455	94,001
Less: Current maturities			76,977	8,552
Long-term debt			$   8,478	$   85,449