<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
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>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               SEP-30-1996
<CASH>                                           1,126
<SECURITIES>                                    16,616
<RECEIVABLES>                                   65,952
<ALLOWANCES>                                       677
<INVENTORY>                                     14,457
<CURRENT-ASSETS>                               111,537
<PP&E>                                         518,598
<DEPRECIATION>                                 193,662
<TOTAL-ASSETS>                                 507,397
<CURRENT-LIABILITIES>                           78,200
<BONDS>                                        177,100
<COMMON>                                         3,091
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     194,418
<TOTAL-LIABILITY-AND-EQUITY>                   507,397
<SALES>                                         39,244
<TOTAL-REVENUES>                               291,140
<CGS>                                           30,455
<TOTAL-COSTS>                                  189,805
<OTHER-EXPENSES>                                63,638
<LOSS-PROVISION>                                   123
<INTEREST-EXPENSE>                               9,913
<INCOME-PRETAX>                                 32,594
<INCOME-TAX>                                    12,022
<INCOME-CONTINUING>                             20,572
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    20,572
<EPS-PRIMARY>                                      .79
<EPS-DILUTED>                                      .79