<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10Q FOR
THE PERIOD ENDED SEPTEMBER 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          18,737
<SECURITIES>                                   109,408
<RECEIVABLES>                                   68,739
<ALLOWANCES>                                         0
<INVENTORY>                                      5,101
<CURRENT-ASSETS>                               322,566
<PP&E>                                         130,731
<DEPRECIATION>                                  65,638
<TOTAL-ASSETS>                                 502,876
<CURRENT-LIABILITIES>                          164,873
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             1
<OTHER-SE>                                     330,861
<TOTAL-LIABILITY-AND-EQUITY>                   502,876
<SALES>                                              0
<TOTAL-REVENUES>                               284,169
<CGS>                                                0
<TOTAL-COSTS>                                  207,182
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 23,378
<INCOME-TAX>                                     8,214
<INCOME-CONTINUING>                             15,164
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,164
<EPS-PRIMARY>                                      .30
<EPS-DILUTED>                                        0