##### 



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 31,2006
    
    
    2005
    
    
    2004
    
    
    2003
    
    
    2002Loss before income taxes
    
    $
    (53,316
    )
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,038
    )
    
    $
    (45,235
    )Add: Fixed charges
    
    
    12,415
    
    
    
    13,263
    
    
    
    13,433
    
    
    
    10,743
    
    
    
    6,576Less: Capitalized interest
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    (832
    )
    
    
    (765
    )Earnings, as defined
    
    $
    (40,901
    )
    
    $
    (45,748
    )
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )Interest expense
    
    $
    10,465
    
    
    $
    10,679
    
    
    $
    9,885
    
    
    $
    5,360
    
    
    $
    1,011Capitalized interest
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    832
    
    
    
    765Estimated interest portion of rental expense
    
    
    1,950
    
    
    
    2,584
    
    
    
    3,548
    
    
    
    4,551
    
    
    
    4,800Fixed charges
    
    $
    12,415
    
    
    $
    13,263
    
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576Deficiency of earnings to fixed charges
    
    $
    (53,316
    )
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )Ratio of earnings to fixed charges
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
 Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividend Requirements
 Year Ended December 31,2006
    
    
    2005
    
    
    2004
    
    
    2003
    
    
    2002Earnings, as defined (from above)
    
    $
    (40,901
    )
    
    $
    (45,748
    )
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )Preferred stock dividend requirements
    
    
    
    
    
    
    4
    
    
    
    100
    
    
    
    230
    
    
    
    702Earnings, as defined
    
    $
    (40,901
    )
    
    $
    (45,744
    )
    
    $
    (80,133
    )
    
    $
    (70,897
    )
    
    $
    (38,722
    )Fixed charges (from above)
    
    $
    12,415
    
    
    $
    13,263
    
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576Preferred stock dividend requirements
    
    
    
    
    
    
    4
    
    
    
    100
    
    
    
    230
    
    
    
    702Combined fixed charges and preferred
stock dividend requirements
    
    $
    12,415
    
    
    $
    13,267
    
    
    $
    13,533
    
    
    $
    10,973
    
    
    $
    7,278Deficiency of earnings to combined
fixed charges and preferred stock
dividend requirements
    
    $
    (53,316
    )
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )Ratio of earnings to combined fixed
charges and preferred stock dividend
requirements
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A