<ARTICLE> 5
<MULTIPLIER> 1000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          49,050
<SECURITIES>                                         0
<RECEIVABLES>                                  362,516
<ALLOWANCES>                                  (12,794)
<INVENTORY>                                      9,268
<CURRENT-ASSETS>                               471,012
<PP&E>                                       1,121,250
<DEPRECIATION>                               (752,298)
<TOTAL-ASSETS>                                 916,272
<CURRENT-LIABILITIES>                          396,455
<BONDS>                                         15,100
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        77,637
<OTHER-SE>                                     180,925
<TOTAL-LIABILITY-AND-EQUITY>                   916,272
<SALES>                                              0
<TOTAL-REVENUES>                             2,379,000
<CGS>                                                0
<TOTAL-COSTS>                                2,371,125
<OTHER-EXPENSES>                                 1,847
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,160
<INCOME-PRETAX>                                  6,028
<INCOME-TAX>                                     3,315
<INCOME-CONTINUING>                              2,713
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,713
<EPS-BASIC>                                     0.12
<EPS-DILUTED>                                     0.12