Exhibit 12.1

Statement Regarding Computation of Ratios

Ratio of Earnings to Fixed Charges

(Thousands of Dollars)

	Nine Months Ended September 30,		Twelve Months Ended December 31,
	2009		2008			2007		2006		2005		2004
Earnings:
Income before income taxes, income from affiliates and joint ventures and discountinued operations	$	31,178	$	61,943		$	65,273	$	54,668	$	45,023	$	35,072
Fixed charges, as below		10,908		16,412			10,627		4,127		2,369		1,478
Distributed income of equity investees		491		812			1,160		584		430		336
Interest capitalized		-		(909	)		-		-		-		-
Total earnings		42,577		78,258			77,060		59,379		47,822		36,886
Fixed charges:
Interest expensed and capitalized	$	9,654	$	13,435		$	9,454	$	3,396	$	1,791	$	996
Rental interest factor		1,254		2,977			1,173		731		578		482
Total fixed charges		10,908		16,412			10,627		4,127		2,369		1,478
Ratio of earnings to fixed charges		3.9		4.8			7.3		14.4		20.2		25.0