Exhibit 12.1

STATEMENT RE: COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(in thousands)

	Year Ended December 31,
	2007		2006		2005		2004		2003
Net loss attributable to common shareholders	(148,305	)	(135,819	)	(102,505	)	(252,298	)	(130,031	)
Add: fixed charges	15,421		45,147		18,942		12,504		10,694
Earnings as defined	(132,884	)	(90,672	)	(83,563	)	(239,794	)	(119,337	)
Fixed charges:
Interest expensed and capitalized	14,827		44,582		17,559		10,988		9,326
Estimated interest component of rent	594		565		1,383		1,516		1,368
Total fixed charges	15,421		45,147		18,942		12,504		10,694
Ratio of earnings to fixed charges	(1	)	(1	)	(1	)	(1	)	(1	)

(1) Earnings (as defined) for the period were insufficient to cover fixed charges by an amount equal to the net loss attributable to common shareholders for the period.