Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(in thousands, except ratios)

	Six Months Ended June 30, 2010		12/31/09		12/31/08		12/31/07		12/31/06		12/31/05
Pre-tax income from continuing operations	$	171,936	$	88,317	$	192,084	$	206,344	$	159,906	$	150,289
Interest expense	33,788		50,738		26,209		17,287		10,247		6,048
Capitalized interest	13,054		30,107		23,209		18,104		9,339		—
Earnings	$	205,724	$	139,055	$	218,293	$	223,631	$	170,153	$	156,337
Ratio of earnings to fixed charges	4.4		1.7		4.4		6.3		8.7		25.8

For purposes of this table, “earnings” consists of income before income taxes from continuing operations plus fixed charges and less capitalized interest.  “Fixed charges” consists of interest expense and capitalized interest (for both continuing and discontinued operations).