<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                                       
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           8,106                   1,600                   2,904
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                  139,541                 143,016                 155,869
<ALLOWANCES>                                    13,962                  14,099                  15,829
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                               162,652                 157,595                 169,243
<PP&E>                                         653,448                 668,181                 677,635
<DEPRECIATION>                                 114,017                 121,467                 129,308
<TOTAL-ASSETS>                                 889,572                 900,570                 916,027
<CURRENT-LIABILITIES>                          132,263                 139,595                 140,050
<BONDS>                                        273,626                 262,367                 260,365
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           489                     489                     489
<OTHER-SE>                                     399,070                 412,703                 428,679
<TOTAL-LIABILITY-AND-EQUITY>                   889,572                 900,570                 916,027
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                               213,912                 434,268                 660,874
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                  170,415                 344,923                 523,097
<OTHER-EXPENSES>                                 8,766                  17,855                  27,303
<LOSS-PROVISION>                                 1,480                   3,522                   6,418
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                 23,555                  48,403                  74,595
<INCOME-TAX>                                     7,231                  14,860                  22,901
<INCOME-CONTINUING>                             16,324                  33,543                  51,694
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    16,324                  33,543                  51,694
<EPS-PRIMARY>                                     0.37                    0.75                    1.16
<EPS-DILUTED>                                     0.35                    0.72                    1.11