<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-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                         106,440
<SECURITIES>                                         0
<RECEIVABLES>                                  114,040
<ALLOWANCES>                                    17,505
<INVENTORY>                                     40,072
<CURRENT-ASSETS>                               275,103
<PP&E>                                       1,561,523
<DEPRECIATION>                                 696,945
<TOTAL-ASSETS>                               1,305,258
<CURRENT-LIABILITIES>                          132,358
<BONDS>                                        291,461
<COMMON>                                        20,443
<PREFERRED-MANDATORY>                           29,343
<PREFERRED>                                          0
<OTHER-SE>                                     497,090
<TOTAL-LIABILITY-AND-EQUITY>                 1,305,258
<SALES>                                        407,235
<TOTAL-REVENUES>                               535,540
<CGS>                                          300,676
<TOTAL-COSTS>                                  407,861
<OTHER-EXPENSES>                                41,470
<LOSS-PROVISION>                                 9,116
<INTEREST-EXPENSE>                              15,450
<INCOME-PRETAX>                                 61,643
<INCOME-TAX>                                    23,375
<INCOME-CONTINUING>                             38,268
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                 46,960
<CHANGES>                                            0
<NET-INCOME>                                    85,228
<EPS-PRIMARY>                                     4.17<F1>
<EPS-DILUTED>                                     4.14<F2>
<FN>
<F1>   EPS - Primary is EPS Basic per SFAS 128
<F2>   EPS - Fully Diluted is EPS - Diluted per SFAS 128
</FN>