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Exhibit 12.1 Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined
Fixed Charges and Preferred Stock Dividend Requirements
(in thousands, except for ratios) Ratio of Earnings to Fixed Charges Year Ended December 31,2004
    
    
    2003
    
    
    2002
    
    
    2001
    
    
    2000Income (loss) before income taxes and
cumulative effect of accounting change
    
    $
    (93,666
    )
    
    $
    (81,038
    )
    
    $
    (45,235
    )
    
    $
    (34,185
    )
    
    $
    239,583Add: Fixed charges
    
    
    13,433
    
    
    
    10,743
    
    
    
    6,576
    
    
    
    4,450
    
    
    
    1,386Less: Capitalized interest
    
    
    
    
    
    
    (832
    )
    
    
    (765
    )
    
    
    
    
    
    
    Earnings, as defined
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )
    
    $
    (29,735
    )
    
    $
    240,969Interest expense
    
    $
    9,885
    
    
    $
    5,360
    
    
    $
    1,011
    
    
    $
    500
    
    
    $
    386Capitalized interest
    
    
    
    
    
    
    832
    
    
    
    765
    
    
    
    
    
    
    
    Estimated interest portion of rental expense
    
    
    3,548
    
    
    
    4,551
    
    
    
    4,800
    
    
    
    3,950
    
    
    
    1,000Fixed charges
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576
    
    
    $
    4,450
    
    
    $
    1,386Excess (deficiency) of earnings to fixed charges
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )
    
    $
    (34,185
    )
    
    $
    239,583Ratio of earnings to fixed charges
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    173.9
 Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividend Requirements Year Ended December 31,2004
    
    
    2003
    
    
    2002
    
    
    2001
    
    
    2000Earnings, as defined (from above)
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )
    
    $
    (29,735
    )
    
    $
    240,969Preferred stock dividend requirements
    
    
    100
    
    
    
    230
    
    
    
    702
    
    
    
    785
    
    
    
    756Earnings, as defined
    
    $
    (80,133
    )
    
    $
    (70,897
    )
    
    $
    (38,722
    )
    
    $
    (28,950
    )
    
    $
    241,725Fixed charges (from above)
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576
    
    
    $
    4,450
    
    
    $
    1,386Preferred stock dividend requirements
    
    
    100
    
    
    
    230
    
    
    
    702
    
    
    
    785
    
    
    
    756Combined fixed charges and preferred
stock dividend requirements
    
    $
    13,533
    
    
    $
    10,973
    
    
    $
    7,278
    
    
    $
    5,235
    
    
    $
    2,142Excess (deficiency) of earnings to
combined fixed charges and preferred
stock dividend requirements
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )
    
    $
    (34,185
    )
    
    $
    239,583Ratio of earnings to combined fixed
charges and preferred stock dividend
requirements
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    100.2
 For the purpose of calculating the ratio of earnings to fixed charges, earnings are defined as
consolidated income from continuing operations before income taxes plus fixed charges. Fixed
charges are the sum of interest of all indebtedness, and estimated interest within rental expense.
We have no amortization of debt issuance costs or preference securities. The ratio of earnings to
combined fixed charges and preferred stock dividend requirements includes the tax adjusted deemed
dividend to preferred stockholders.