<ARTICLE> 5
<LEGEND>
This Schedule contains summary financial information extracted from Form 10Q for
the period ended March 31, 1998 and is qualified in its entirety by reference to
such finanical statements.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<EXCHANGE-RATE>                                      1
<CASH>                                          23,743
<SECURITIES>                                     1,923
<RECEIVABLES>                                   67,898
<ALLOWANCES>                                         0
<INVENTORY>                                      7,177
<CURRENT-ASSETS>                               234,401
<PP&E>                                         146,554
<DEPRECIATION>                                  70,882
<TOTAL-ASSETS>                                 516,817
<CURRENT-LIABILITIES>                          165,788
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             1
<OTHER-SE>                                     340,735
<TOTAL-LIABILITY-AND-EQUITY>                   516,817
<SALES>                                              0
<TOTAL-REVENUES>                               114,007
<CGS>                                                0
<TOTAL-COSTS>                                   84,455
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  8,584
<INCOME-TAX>                                     3,676
<INCOME-CONTINUING>                              4,908
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,908
<EPS-PRIMARY>                                      .10
<EPS-DILUTED>                                      .10