<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-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<EXCHANGE-RATE>                                      1
<CASH>                                         179,851
<SECURITIES>                                         0
<RECEIVABLES>                                  115,500
<ALLOWANCES>                                    16,192
<INVENTORY>                                     44,158
<CURRENT-ASSETS>                               330,963
<PP&E>                                       1,751,233
<DEPRECIATION>                                 788,852
<TOTAL-ASSETS>                               1,454,953
<CURRENT-LIABILITIES>                          126,647
<BONDS>                                        383,173
<COMMON>                                        22,649
<PREFERRED-MANDATORY>                           29,377
<PREFERRED>                                          0
<OTHER-SE>                                     536,897
<TOTAL-LIABILITY-AND-EQUITY>                 1,454,953
<SALES>                                        381,651
<TOTAL-REVENUES>                               515,349
<CGS>                                          279,373
<TOTAL-COSTS>                                  396,344
<OTHER-EXPENSES>                                50,039
<LOSS-PROVISION>                                 3,350
<INTEREST-EXPENSE>                              17,414
<INCOME-PRETAX>                                 48,202
<INCOME-TAX>                                    18,474
<INCOME-CONTINUING>                             29,728
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    29,728
<EPS-BASIC>                                     1.31<F1>
<EPS-DILUTED>                                     1.31<F2>
<FN>
<F1> EPS - Primary  is EPS Basic per SFAS 128
<F2> EPS - Fully  Diluted is EPS - Diluted per SFAS 128
</FN>