Exhibit 12.1

CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES

	2002		2003			2004			2005			2006
	(in thousands)
Earnings available for fixed charges:
Income before income taxes	$	155,833	$	31,657		$	111,890		$	326,102		$	90,523
Fixed charges		27,393		58,594			70,724			114,965			202,074
Amortization of capitalized interest		—		—			90			408			843
Capitalized interest		—		(127	)		(2,919	)		(3,564	)		(17,503	)
Total earnings available for fixed charges:	$	183,226	$	90,124		$	179,785		$	437,911		$	275,937
Fixed charges:
Interest expense (1)	$	6,720	$	11,115		$	19,030		$	58,033		$	115,985
Portion of rent expense representative of interest (2)		7,974		9,525			12,552			17,202			28,199
Capitalized interest		—		127			2,919			3,564			17,503
Net preferred stock dividends (3)		12,699		37,827			36,223			36,166			40,387
Total fixed charges:	$	27,393	$	58,594		$	70,724		$	114,965		$	202,074
Ratio of earnings to fixed charges:		6.69x		1.54x			2.54x			3.81x			1.37x

(1)	Interest expense includes amortization of deferred debt issuance costs and discounts related to indebtedness.
(2)	The portion of operating rental expense that management believes is representative of interest is estimated to be 33%.
(3)	Net preferred stock dividends are the company’s preferred dividend expense net of income tax benefit.