Exhibit 12 Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends Six Months Ended (in thousands) Year Ended September 30, March 31, ------------------------------------------------------ ------------ 2000 2001 2002 2003 2004 2005 ------------------------------------------------------ ------------ Fixed Charges Computation Interest expensed and capitalized $ 3,603 $ 145 $ 417 $12,060 $ 13,857 $ 28,180 Amortized premiums, discounts, and capitalized expenses related to indebtedness 3,034 79 136 3,857 6,031 6,741 Reasonable approximation of interest within rental expense 26 20 72 1,139 1,462 1,099 ------------------------------------------------------ ------------ Total Fixed Charges 6,663 244 625 17,056 21,350 36,020 Preferred equity dividends 378 113 - - - - ------------------------------------------------------ ------------ Total Fixed Charges and Preferred Equity Dividends $ 7,041 $ 357 $ 625 $17,056 $ 21,350 $ 36,020 ====================================================== ============ Earnings Computation Pre-tax income from continuing operations before adjustment for minority interests in consolidated subsidiaries or income or loss from equity investees $ 8,642 $14,468 $40,236 $60,081 $105,107 $ 36,501 Plus Fixed charges 7,041 357 625 17,056 21,350 36,020 Minus Interest capitalized - - - 230 435 240 ------------------------------------------------------ ------------ Total Earnings $15,683 $14,825 $40,861 $76,907 $126,022 $ 72,281 ====================================================== ============ Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends 2.23 41.53 65.38 4.51 5.90 2.01