<ARTICLE> 5
<LEGEND>
This schedule contains financial information extracted from SEC filing Form
10-Q and is qualified in its entirety by reference to such financial statements.
</LEGEND>
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998     
<PERIOD-END>                               SEP-30-1998
<CASH>                                             957
<SECURITIES>                                         0
<RECEIVABLES>                                  134,672
<ALLOWANCES>                                     4,475
<INVENTORY>                                     15,678
<CURRENT-ASSETS>                               181,434
<PP&E>                                         719,088
<DEPRECIATION>                                 274,717
<TOTAL-ASSETS>                               2,237,069
<CURRENT-LIABILITIES>                          215,749
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           446
<OTHER-SE>                                     788,283
<TOTAL-LIABILITY-AND-EQUITY>                 2,237,069
<SALES>                                        694,099
<TOTAL-REVENUES>                               694,099
<CGS>                                                0
<TOTAL-COSTS>                                  570,046
<OTHER-EXPENSES>                               (2,019)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              44,535
<INCOME-PRETAX>                                 81,537
<INCOME-TAX>                                    41,584
<INCOME-CONTINUING>                             39,953
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    39,953
<EPS-PRIMARY>                                     0.94
<EPS-DILUTED>                                     0.93