Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt

	December 31
(Thousands of dollars)	2012			2011
Notes payable
2.50% notes, due 2017, net of unamortized discount of $76 at December 31, 2012	$	549,924			0
3.70% notes, due 2022, net of unamortized discount of $2,415 at December 31, 2012		597,585			0
4.00% notes, due 2022, net of unamortized discount of $1,004 at December 31, 2012		498,996			0
7.05% notes, due 2029, net of unamortized discount of $1,523 at December 31, 2012		248,477			248,384
5.125% notes, due 2042, net of unamortized discount of $904 at December 31, 2012		349,096			0
6.375% notes, due 2012, net of unamortized discount of $38 at December 31, 2011		0			349,962
Other, 6%, due through 2028		1,169			1,212
Total debt including current maturities		2,245,247			599,558
Current maturities		(46	)		(350,005	)
Total long-term debt	$	2,245,201			249,553