Exhibit 12.1

Statement Regarding Computation of Ratio

Ratio of Earnings to Fixed Charges

(Thousands of Dollars)

	Six Months Ended June 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	$	14,667	$	61,943		$	65,273	$	54,668	$	45,023	$	35,072
Fixed charges, as below		7,519		16,412			10,627		4,127		2,369		1,478
Distributed income of equity investees		177		812			1,160		584		430		336
Interest capitalized		-		(909	)		-		-		-		-
Total earnings		22,363		78,258			77,060		59,379		47,822		36,886
Fixed charges:
Interest expensed and capitalized	$	6,683	$	13,435		$	9,454	$	3,396	$	1,791	$	996
Rental interest factor		836		2,977			1,173		731		578		482
Total fixed charges		7,519		16,412			10,627		4,127		2,369		1,478
Ratio of earnings to fixed charges		3.0		4.8			7.3		14.4		20.2		25.0