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EXHIBIT 12.1
STATEMENT REGARDING COMPUTATION OF RATIOS
<Table>
<Caption>
YEARS ENDED DECEMBER 31,
----------------------------------------------------
1999 2000 2001 2002 2003
-------- --------- -------- ------- --------
Income (loss) from continuing operations
before income taxes, minority interest
and cumulative effect of accounting
change................................ $ 9,990 $(782,826) $ 13,318 $ 6,617 $ 90,203
Distributions from affiliates........... 21,600 6,700 -- -- --
Equity (earnings) loss from
affiliates............................ 7,092 21,438 358 153 (119)
Fixed charges........................... 89,621 153,330 133,718 91,910 78,948
Less interest capitalized............... (37,700) (8,330) -- -- (900)
-------- --------- -------- ------- --------
Earnings................................ $ 90,603 $(609,688) $147,394 $98,680 $168,132
======== ========= ======== ======= ========
Interest expense........................ $ 44,020 $ 129,316 $110,605 $80,094 $ 70,543
Interest capitalized.................... 37,700 8,330 -- -- 900
Amortization of debt discount and
premium and issuance expense.......... 7,901 15,684 23,113 11,816 7,505
-------- --------- -------- ------- --------
Fixed charges........................... $ 89,621 $ 153,330 $133,718 $91,910 $ 78,948
======== ========= ======== ======= ========
Ratio of Earnings to Fixed Charges...... 1.0x N/A 1.1x 1.1x 2.1x
======== ========= ======== ======= ========
</Table>