<ARTICLE>    5
<MULTIPLIER>   1,000

                                           
<PERIOD-TYPE>                                 6-MOS
<FISCAL-YEAR-END>                             DEC-31-1999
<PERIOD-END>                                  JUN-30-1999
<CASH>                                             21,700
<SECURITIES>                                       29,200
<RECEIVABLES>                                      75,200
<ALLOWANCES>                                        2,100
<INVENTORY>                                        22,800
<CURRENT-ASSETS>                                  145,000
<PP&E>                                          2,858,000
<DEPRECIATION>                                  1,537,000
<TOTAL-ASSETS>                                  1,518,100
<CURRENT-LIABILITIES>                             155,200
<BONDS>                                                 0
<PREFERRED-MANDATORY>                                   0
<PREFERRED>                                             0
<COMMON>                                            1,700
<OTHER-SE>                                        596,300
<TOTAL-LIABILITY-AND-EQUITY>                    1,518,100
<SALES>                                           179,000
<TOTAL-REVENUES>                                  180,600
<CGS>                                             391,800
<TOTAL-COSTS>                                     391,800
<OTHER-EXPENSES>                                        0
<LOSS-PROVISION>                                        0
<INTEREST-EXPENSE>                                 14,900
<INCOME-PRETAX>                                  (225,500)
<INCOME-TAX>                                       69,600
<INCOME-CONTINUING>                              (155,900)
<DISCONTINUED>                                          0
<EXTRAORDINARY>                                    (4,200)
<CHANGES>                                               0
<NET-INCOME>                                     (160,100)
<EPS-BASIC>                                       (1.29)
<EPS-DILUTED>                                       (1.29)