<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONSOLIDATED
BALANCE SHEETS AND STATEMENTS OF EARNINGS AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                           1,544
<SECURITIES>                                    18,199
<RECEIVABLES>                                   80,604
<ALLOWANCES>                                       738
<INVENTORY>                                     16,361
<CURRENT-ASSETS>                               129,885
<PP&E>                                         518,773
<DEPRECIATION>                                 200,049
<TOTAL-ASSETS>                                 524,530
<CURRENT-LIABILITIES>                           89,691
<BONDS>                                        176,617
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,091
<OTHER-SE>                                     202,663
<TOTAL-LIABILITY-AND-EQUITY>                   524,530
<SALES>                                         58,350
<TOTAL-REVENUES>                               390,638
<CGS>                                           44,295
<TOTAL-COSTS>                                  252,488
<OTHER-EXPENSES>                                87,466
<LOSS-PROVISION>                                   353
<INTEREST-EXPENSE>                              13,349
<INCOME-PRETAX>                                 43,418
<INCOME-TAX>                                    16,189
<INCOME-CONTINUING>                             27,229
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    27,229
<EPS-PRIMARY>                                     1.05
<EPS-DILUTED>                                     1.05