<ARTICLE> 5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
consolidated  statement of earnings and the  consolidated  balance sheets and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<EXCHANGE-RATE>                                      1
<CASH>                                         174,492
<SECURITIES>                                         0
<RECEIVABLES>                                  167,921
<ALLOWANCES>                                    18,075
<INVENTORY>                                     37,452
<CURRENT-ASSETS>                               393,823
<PP&E>                                       1,456,749
<DEPRECIATION>                                 629,376
<TOTAL-ASSETS>                               1,393,005
<CURRENT-LIABILITIES>                          213,083
<BONDS>                                        346,081
<COMMON>                                        20,443
<PREFERRED-MANDATORY>                           29,301
<PREFERRED>                                          0
<OTHER-SE>                                     429,061
<TOTAL-LIABILITY-AND-EQUITY>                 1,393,005
<SALES>                                        312,538
<TOTAL-REVENUES>                               376,920
<CGS>                                          239,099
<TOTAL-COSTS>                                  294,646
<OTHER-EXPENSES>                                21,761
<LOSS-PROVISION>                                 6,735
<INTEREST-EXPENSE>                               8,790
<INCOME-PRETAX>                                 44,988
<INCOME-TAX>                                    16,765
<INCOME-CONTINUING>                             28,223
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    28,223
<EPS-PRIMARY>                                     1.38
<EPS-DILUTED>                                     1.38