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EXHIBIT 12
COMPUTATION OF EARNINGS TO FIXED CHARGES
<Table>
<Caption>
3 Mos Ended 12 Mos Ended 3 Mos Ended 12 Mos Ended
Mar. 31, 2003 Dec. 31, 2002 Mar. 31, 2002 Dec. 31, 2001
------------- ------------- ------------- -------------
COMPUTATION OF EARNINGS:
REGISTRANT'S PRETAX INCOME FROM
CONTINUING OPERATIONS 9,401,597 64,737,055 11,280,212 (18,135,897)
CAPITALIZED INTEREST 108,248 432,992 94,352 217,288
------------ ------------ ------------ ------------
TOTAL EARNINGS 9,509,845 65,170,047 11,374,564 (17,918,609)
COMPUTATION OF FIXED CHARGES:
INTEREST EXPENSE 13,295,608 55,428,317 14,754,207 68,542,792
CAPITALIZED INTEREST 0 0 13,896 215,704
AMORTIZATION OF DEBT ISSUE COST 583,620 2,364,680 591,170 2,387,828
INTEREST FACTOR ON RENT EXPENSE 8,699,767 34,955,902 9,583,203 38,245,508
------------ ------------ ------------ ------------
TOTAL FIXED CHARGES 22,578,995 92,748,899 24,942,476 109,391,832
TOTAL EARNINGS AND FIXED CHARGES 32,088,840 157,918,946 36,317,040 91,473,223
------------ ------------ ------------ ------------
RATIO OF EARNINGS TO FIXED CHARGES 1.42 1.70 1.46 --
============ ============ ============ ============
<Caption>
12 Mos Ended 12 Mos Ended 12 Mos Ended
Dec. 31, 2000 Dec. 31, 1999 Dec. 31, 1998
------------- ------------- -------------
COMPUTATION OF EARNINGS:
REGISTRANT'S PRETAX INCOME FROM
CONTINUING OPERATIONS (10,171,364) 7,711,789 22,476,984
CAPITALIZED INTEREST (180,622) (3,987,319) (4,182,404)
------------ ------------ ------------
TOTAL EARNINGS (10,351,986) 3,724,470 18,294,580
COMPUTATION OF FIXED CHARGES:
INTEREST EXPENSE 73,151,772 59,011,239 42,257,979
CAPITALIZED INTEREST 613,614 4,312,499 4,397,643
AMORTIZATION OF DEBT ISSUE COST 885,449 855,839 755,601
INTEREST FACTOR ON RENT EXPENSE 36,162,868 29,936,114 20,427,123
------------ ------------ ------------
TOTAL FIXED CHARGES 110,813,703 94,115,691 67,838,346
TOTAL EARNINGS AND FIXED CHARGES 100,461,717 97,840,161 86,132,926
------------ ------------ ------------
RATIO OF EARNINGS TO FIXED CHARGES -- 1.04 1.27
============ ============ ============
</Table>
For the years ended December 31, 2001 and 2000, earnings were insufficient to
cover fixed charges by $17.9 million and $10.4 million, respectively.