<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                          31,800
<SECURITIES>                                    23,200
<RECEIVABLES>                                  192,800
<ALLOWANCES>                                    14,200
<INVENTORY>                                          0
<CURRENT-ASSETS>                               301,900
<PP&E>                                         732,800
<DEPRECIATION>                                 371,100
<TOTAL-ASSETS>                               1,565,900
<CURRENT-LIABILITIES>                          289,300
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       153,800
<OTHER-SE>                                     855,400
<TOTAL-LIABILITY-AND-EQUITY>                 1,565,900
<SALES>                                              0
<TOTAL-REVENUES>                             1,035,500
<CGS>                                                0
<TOTAL-COSTS>                                  883,200
<OTHER-EXPENSES>                                   100
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              16,900
<INCOME-PRETAX>                                146,600
<INCOME-TAX>                                    56,600
<INCOME-CONTINUING>                             90,000
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    90,000
<EPS-BASIC>                                       0.59
<EPS-DILUTED>                                     0.57