<ARTICLE> 5
<LEGEND> This schedule contains summary financial information extracted from
condensed consolidated balance sheet as of March 31, 1998 and consolidated
statement of income for the three months then ended and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                         DEC-31-1998
<PERIOD-START>                            JAN-01-1998
<PERIOD-END>                              MAR-31-1998
<CASH>                                          5,245
<SECURITIES>                                        0         
<RECEIVABLES>                                  86,553
<ALLOWANCES>                                        0
<INVENTORY>                                    46,598
<CURRENT-ASSETS>                              148,558 
<PP&E>                                        533,345
<DEPRECIATION>                                329,627
<TOTAL-ASSETS>                                373,660
<CURRENT-LIABILITIES>                          83,411
<BONDS>                                             0
<PREFERRED-MANDATORY>                               0
<PREFERRED>                                    19,671
<COMMON>                                       10,354
<OTHER-SE>                                    111,249
<TOTAL-LIABILITY-AND-EQUITY>                  373,660
<SALES>                                       150,388 
<TOTAL-REVENUES>                              150,388
<CGS>                                         122,559         
<TOTAL-COSTS>                                 138,990 
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                              1,907
<INCOME-PRETAX>                                 9,538
<INCOME-TAX>                                    3,816
<INCOME-CONTINUING>                             5,722
<DISCONTINUED>                                      0 
<EXTRAORDINARY>                                     0
<CHANGES>                                           0 
<NET-INCOME>                                    5,722
<EPS-PRIMARY>                                    0.56
<EPS-DILUTED>                                    0.52