EXHIBIT 12.1

Ratio of Earnings to Fixed Charges
(dollars in thousands, except ratio data)

	Year Ended December 31,
	2006			2005			2004			2003			2002
Fixed Charges:
Interest expense on indebtedness (including amortization of debt expense and discount)	$	29,492		$	17,849		$	22,868		$	23,723		$	23,746
Interest expense on portion of rent expense representative of interest		19,899			14,614			9,089			7,604			7,206
Total Fixed Charges	$	49,391		$	32,463		$	31,957		$	31,327		$	30,952
Earnings (Loss):
Net loss before provision for income taxes and cumulative effect of change in accounting principle	$	(251,173	)	$	(239,439	)	$	(242,898	)	$	(185,324	)	$	(219,716	)
Fixed Charges per above		49,391			32,463			31,957			31,327			30,952
Total Earnings (Loss)	$	(201,782	)	$	(206,976	)	$	(210,941	)	$	(153,997	)	$	(188,764	)
Ratio of Earnings to Fixed Charges		—			—			—			—			—
Coverage deficiency(1)(2)(3)	$	(251,173	)	$	(239,439	)	$	(242,898	)	$	(185,324	)	$	(219,716	)

(1)	The Company’s Coverage deficiency for 2006 includes charges for lease termination and restructuring of $29,510 partially offset by a gain on the sale of an equity investment of $14,759.
(2)	The Company’s Coverage deficiency for 2004 includes net charges of $12,975, relating to a $15,408 charge for restructuring partially offset by a gain recognized on the extinguishment of debt of $2,433.
(3)	The Company’s Coverage deficiency for 2002 includes charges aggregating $46,396 arising from the Company’s impairment charge relating to its investment in CAT and a charge for construction design changes of $32,158 and $14,238, respectively.