EXHIBIT 12 RATIO OF EARNINGS TO COMBINED FIXED CHARGES Six Months Ended Year Ended December 31, June 30, Pro Forma Pro Forma -------------------------------------- ---------------- Year Ended Twelve Months Ended 1993 1994 1995 1996 1997 1997 1998 December 31, 1997 June 30, 1998 ---- ---- ---- ---- ---- ---- ---- ----------------- ------------------- (in thousands) Statement of Operations Data: Income (loss) before income taxes and extraordinary loss $1,985 $374 $1,234 $4,829 $11,150 $5,074 $6,349 $221 $343 Add: Portion of rents representative of the interest factor 175 346 636 3,408 4,489 1,770 4,874 6,573 6,666 Interest on indebtedness 4,694 4,876 5,721 5,473 6,424 3,245 3,608 18,891 19,267 Amortization of debt issuance costs 355 172 109 103 257 44 108 1,392 1,456 -------------------------------------- --------------- ----------------- ------------------- Income as adjusted 7,209 5,768 7,700 13,813 22,320 10,133 14,939 27,077 27,732 -------------------------------------- --------------- ----------------- ------------------- Fixed charges: Portion of rents representative of the interest factor 175 346 636 3,408 4,489 1,770 4,874 6,573 6,666 Interest on indebtedness 4,694 4,876 5,721 5,473 6,424 3,245 3,608 18,891 19,267 Amortization of debt issuance costs 355 172 109 103 257 44 108 1,392 1,456 Preferred stock dividend requirement -- -- -- -- -- -- -- 9,311 9,627 -------------------------------------- --------------- ----------------- ------------------- Fixed charges 5,224 5,394 6,466 8,984 11,170 5,059 8,590 36,166 37,016 -------------------------------------- --------------- ----------------- ------------------- Ratio of earnings to combined fixed charges 1.4 1.1 1.2 1.5 2.0 2.0 1.7 0.7 0.7 ====================================== =============== ================= =================== Deficiency of earnings to combined fixed charges and preferred stock dividend -- -- -- -- -- -- -- (9,089) (9,284)