<ARTICLE> 5
<LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 
CONDENSED CONSOLIDATED BALANCE SHEET AS OF JUNE 30, 1997 AND CONSOLIDATED 
STATEMENT OF INCOME FOR THE SIX MONTHS THEN ENDED AND IS QUALIFIED IN ITS 
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. 
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                         DEC-31-1997
<PERIOD-END>                              JUN-30-1997
<CASH>                                          4,182 
<SECURITIES>                                        0 
<RECEIVABLES>                                  87,370 
<ALLOWANCES>                                        0 
<INVENTORY>                                    43,825 
<CURRENT-ASSETS>                              149,272       
<PP&E>                                        515,534      
<DEPRECIATION>                                305,673    
<TOTAL-ASSETS>                                383,887      
<CURRENT-LIABILITIES>                          77,102    
<BONDS>                                       105,671  
<PREFERRED-MANDATORY>                               0 
<PREFERRED>                                    19,924 
<COMMON>                                       10,270 
<OTHER-SE>                                    105,264       
<TOTAL-LIABILITY-AND-EQUITY>                  383,887         
<SALES>                                       293,320          
<TOTAL-REVENUES>                              293,320          
<CGS>                                         241,991          
<TOTAL-COSTS>                                 271,780          
<OTHER-EXPENSES>                                    0       
<LOSS-PROVISION>                                    0      
<INTEREST-EXPENSE>                              3,770       
<INCOME-PRETAX>                                18,000       
<INCOME-TAX>                                    7,200      
<INCOME-CONTINUING>                            10,800      
<DISCONTINUED>                                      0  
<EXTRAORDINARY>                                     0      
<CHANGES>                                           0  
<NET-INCOME>                                   10,800 
<EPS-PRIMARY>                                    1.04 
<EPS-DILUTED>                                     .98