<TABLE> <S> <C>

<PAGE>

<S>                                                <C>
<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>                                          16,949
<SECURITIES>                                         0
<RECEIVABLES>                                  341,268
<ALLOWANCES>                                         0
<INVENTORY>                                     14,617
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<PP&E>                                         414,080
<DEPRECIATION>                               (153,070)
<TOTAL-ASSETS>                               1,296,200
<CURRENT-LIABILITIES>                          196,918
<BONDS>                                        321,603
                                0
                                          0
<COMMON>                                           918
<OTHER-SE>                                     736,828
<TOTAL-LIABILITY-AND-EQUITY>                 1,296,200
<SALES>                                              0
<TOTAL-REVENUES>                               631,008
<CGS>                                                0
<TOTAL-COSTS>                                  582,413
<OTHER-EXPENSES>                              (27,566)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              13,111
<INCOME-PRETAX>                                 63,050
<INCOME-TAX>                                    23,959
<INCOME-CONTINUING>                             39,091
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    39,091
<EPS-BASIC>                                        .38
<EPS-DILUTED>                                      .38


</TABLE>



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