<ARTICLE> 5
<RESTATED>

                                                  
<PERIOD-TYPE>                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1998             DEC-31-1997
<CASH>                                          13,691                   7,772
<SECURITIES>                                     6,975                   2,301
<RECEIVABLES>                                  243,390                 179,198
<ALLOWANCES>                                         0                       0
<INVENTORY>                                     14,682                   8,078
<CURRENT-ASSETS>                               322,016                 243,821
<PP&E>                                         309,402                 250,268
<DEPRECIATION>                                  88,458                  59,221
<TOTAL-ASSETS>                               1,033,528                 883,430
<CURRENT-LIABILITIES>                          143,754                 122,600
<BONDS>                                        234,474                 189,377
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           812                     758
<OTHER-SE>                                     628,986                 553,540
<TOTAL-LIABILITY-AND-EQUITY>                 1,033,528                 883,430
<SALES>                                              0                       0
<TOTAL-REVENUES>                               836,596                 625,413
<CGS>                                                0                       0
<TOTAL-COSTS>                                  724,523                 585,711
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                              15,908                  12,474
<INCOME-PRETAX>                                 96,165                  27,228
<INCOME-TAX>                                    36,184                  11,593
<INCOME-CONTINUING>                             59,981                  15,635
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    59,981                  15,635
<EPS-BASIC>                                       0.61                    0.17
<EPS-DILUTED>                                     0.60                    0.16