EXHIBIT 12.1

STATEMENT REGARDING CALCULATION OF RATIOS

	Years Ended December 31,
	2001		2002			2003			2004			2005
Earnings:
Income (loss) before income taxes	$	2,659	$	(14,512	)	$	(129,741	)	$	(53,161	)	$	(165,709	)
Add: fixed charges		10,190		10,370			13,176			10,083			15,992
Less: capitalized interest		—		(531	)		(2,245	)		(3,786	)		(3,911	)
Earnings	$	12,849	$	(4,673	)	$	(118,810	)	$	(46,864	)	$	(153,628	)
Fixed Charges:
Interest expensed and capitalized	$	9,709	$	9,677		$	12,015		$	8,814		$	14,088
Estimated interest portion of rent expense		481		693			1,161			1,269			1,904
Fixed charges	$	10,190	$	10,370		$	13,176		$	10,083		$	15,992
Ratio of earnings to fixed charges(1)		1.26		N/A			N/A			N/A			N/A
Earnings insufficiency			$	(15,043	)	$	(131,986	)	$	(56,947	)	$	(169,620	)

(1) Loss before income taxes for the years ended December 31, 2002, 2003 and 2004 and 2005 was not sufficient to cover fixed charges by a total of approximately $15.0 million in 2002, $132.0 million in 2003, $56.9 million in 2004 and $169.6 million in 2005. As a result, the ratio of earnings to fixed charges has not been computed for any of these periods.