<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS, CONSOLIDATED STATEMENTS OF INCOME, AND NOTES TO THE
CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FORM 10-K, DECEMBER 31, 1996.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          38,663
<SECURITIES>                                    33,567
<RECEIVABLES>                                  124,817
<ALLOWANCES>                                       693
<INVENTORY>                                     13,493
<CURRENT-ASSETS>                               263,805
<PP&E>                                         456,891
<DEPRECIATION>                                 278,376
<TOTAL-ASSETS>                                 473,045
<CURRENT-LIABILITIES>                          171,263
<BONDS>                                         43,602
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           182
<OTHER-SE>                                     233,423
<TOTAL-LIABILITY-AND-EQUITY>                   473,045
<SALES>                                        928,799
<TOTAL-REVENUES>                               928,799
<CGS>                                          818,144
<TOTAL-COSTS>                                  889,731
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,367
<INCOME-PRETAX>                                 43,409
<INCOME-TAX>                                    16,061
<INCOME-CONTINUING>                             27,348
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    27,348
<EPS-PRIMARY>                                     1.51
<EPS-DILUTED>                                     1.51