<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                                       
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998             DEC-31-1998
<PERIOD-START>                             JAN-01-1998             JAN-01-1998             JAN-01-1998
<PERIOD-END>                               MAR-31-1998             JUN-30-1998             SEP-30-1998
<CASH>                                          11,800                     100                     100
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                  135,600                 159,700                 164,800
<ALLOWANCES>                                     8,400                  10,100                  11,400
<INVENTORY>                                     15,300                  15,500                  14,600
<CURRENT-ASSETS>                               183,900                 204,300                 209,400
<PP&E>                                       1,706,200               1,741,800               1,766,700
<DEPRECIATION>                               1,119,300               1,157,200               1,157,100
<TOTAL-ASSETS>                                 844,300                 885,900                 920,200
<CURRENT-LIABILITIES>                          311,600                 348,400                 351,900
<BONDS>                                        267,800                 267,600                 267,400
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                       136,500                 136,600                 136,400
<OTHER-SE>                                      29,300                  34,700               (168,600)
<TOTAL-LIABILITY-AND-EQUITY>                   844,300                 885,900                 920,200
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                               216,500                 436,000                 685,600
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                  175,300                 355,300                 530,800
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                 1,000                   1,600                   3,400
<INTEREST-EXPENSE>                               4,400                  10,800                  17,800
<INCOME-PRETAX>                                 34,400                  59,200                  92,200
<INCOME-TAX>                                    11,900                  20,600                  32,600
<INCOME-CONTINUING>                             22,500                  38,600                  59,600
<DISCONTINUED>                                     300                  26,700                  54,100
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    22,800                  65,300                 113,700
<EPS-PRIMARY>                                      .17                     .48                     .84
<EPS-DILUTED>                                      .16                     .47                     .82