<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>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                         170,870
<SECURITIES>                                         0
<RECEIVABLES>                                  123,930
<ALLOWANCES>                                    19,910
<INVENTORY>                                     46,403
<CURRENT-ASSETS>                               346,904
<PP&E>                                       1,569,439
<DEPRECIATION>                                 665,440
<TOTAL-ASSETS>                               1,417,720
<CURRENT-LIABILITIES>                          157,835
<BONDS>                                        374,461
<COMMON>                                        22,416
<PREFERRED-MANDATORY>                           29,309
<PREFERRED>                                          0
<OTHER-SE>                                     463,371
<TOTAL-LIABILITY-AND-EQUITY>                 1,417,720
<SALES>                                        483,645
<TOTAL-REVENUES>                               616,140
<CGS>                                          365,869
<TOTAL-COSTS>                                  476,696
<OTHER-EXPENSES>                                50,030
<LOSS-PROVISION>                                10,453
<INTEREST-EXPENSE>                              18,864
<INCOME-PRETAX>                                 60,097
<INCOME-TAX>                                    19,966
<INCOME-CONTINUING>                             40,131
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    40,131
<EPS-PRIMARY>                                     1.80<F1>
<EPS-DILUTED>                                     1.79<F2>
<FN>
<F1>   EPS - Primary is EPS Basic per SFAS 128
<F2>   EPS - Fully Diluted is EPS - Diluted per SFAS 128
</FN>