1
                                                                      Exhibit 12


                      RATIOS OF EARNINGS TO FIXED CHARGES
                           AND COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS
                          (In 000's except for ratios)





                                                            NINE MONTHS ENDED
                                                               SEPTEMBER 30,               
                                                         --------------------------        
                                                           1996             1995           
                                                         ---------        ---------        


                                                                                  
Pre-tax income (loss) from continuing operations         $  81,547        $  45,570        

Total Fixed Charges without Preferred Dividends             24,479           12,673        

Interest capitalized during the period                        (555)            (384)       

Amortization of interest capitalized                           750              646        

                                                         ---------        ---------        
Earnings                                                 $ 106,221        $  58,505        
                                                         =========        =========        

Fixed Charges:
      Interest including amounts capitalized             $  21,050        $  10,804        
      Amortization of debt discount and expenses             1,045              481        
      Interest Element of Rental Expense (1)                 2,384            1,388

      Preferred Dividends                                    4,320            5,674        
                                                         ---------        ---------        

Total of Fixed Charges and Preferred Dividends           $  28,799        $  18,346        
                                                         =========        =========        

Total of Fixed Charges without Preferred Dividends       $  24,479        $  12,673        
                                                         =========        =========        


Ratio of Earnings to Fixed Charges                            4.33             4.61        
                                                         =========        =========        

Ratio of Earnings to Combined Fixed Charges and
Preferred Stock Dividends                                     3.68             3.18        
                                                         =========        =========        


Coverage Deficiency in Earnings to cover Fixed
Charges                                                       --               --          
                                                         =========        =========        

Coverage Deficiency in Earnings to cover combined
Fixed Charges and Preferred Stock Dividends                   --               --          
                                                         =========        =========        


                                                
                                                                                    YEAR ENDED DECEMBER 31,
                                                         --------------------------------------------------------------------- 
                                                           1995           1994           1993           1992           1991    
                                                         ---------      ---------      ---------      ---------      --------- 
                                                                                                                               
                                                                                                                               
                                                                                                             
Pre-tax income (loss) from continuing operations         $  67,233      $ (17,727)     $  (2,174)     $ (41,481)     $ (27,392)
                                                                                                                               
Total Fixed Charges without Preferred Dividends             18,754         10,575         25,064         35,937         36,121 
                                                                                                                               
Interest capitalized during the period                        (522)          (292)          (352)        (1,400)        (1,590)
                                                                                                                               
Amortization of interest capitalized                           880            906            866            838            706 
                                                                                                                               
                                                         ---------      ---------      ---------      ---------      --------- 
Earnings                                                 $  86,345      $  (6,539)     $  23,404      $  (6,106)     $   7,845 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
Fixed Charges:                                                                                                                 
      Interest including amounts capitalized             $  16,104      $   8,603      $  19,645      $  30,582      $  26,503 
      Amortization of debt discount and expenses               700            528          3,684          3,523          7,746 
      Interest Element of Rental Expense                     1,950          1,444          1,735          1,832          1,872
                                                                                                                               
      Preferred Dividends                                    7,608          5,750          2,208          5,227          4,829 
                                                         ---------      ---------      ---------      ---------      --------- 
                                                                                                                               
Total of Fixed Charges and Preferred Dividends           $  26,362      $  16,325      $  27,272      $  41,164      $  40,950 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
Total of Fixed Charges without Preferred Dividends       $  18,754      $  10,575      $  25,064      $  35,937      $  36,121 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
                                                                                                                               
Ratio of Earnings to Fixed Charges                            4.60            N/M            N/M            N/M            N/M 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
Ratio of Earnings to Combined Fixed Charges and                                                                                
Preferred Stock Dividends                                     3.27            N/M            N/M            N/M            N/M 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
                                                                                                                               
Coverage Deficiency in Earnings to cover Fixed                                                                                 
Charges                                                       --        $  17,156      $   1,660      $  42,043      $  28,276 
                                                         =========      =========      =========      =========      ========= 
                                                                                                                               
Coverage Deficiency in Earnings to cover combined                                                                              
Fixed Charges and Preferred Stock Dividends                   --        $  22,906      $   3,868      $  47,270      $  33,105 
                                                         =========      =========      =========      =========      ========= 


(1)  Represents the interest component of rentals estimated as one-third of
     rental expense.