<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-Q
FOR THE PERIOD ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          26,362
<SECURITIES>                                   101,907
<RECEIVABLES>                                   67,218
<ALLOWANCES>                                         0
<INVENTORY>                                      5,033
<CURRENT-ASSETS>                               309,022
<PP&E>                                         124,837
<DEPRECIATION>                                  62,305
<TOTAL-ASSETS>                                 475,285
<CURRENT-LIABILITIES>                          144,305
<BONDS>                                              0
<COMMON>                                             1
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     323,224
<TOTAL-LIABILITY-AND-EQUITY>                   475,285
<SALES>                                              0
<TOTAL-REVENUES>                               183,389
<CGS>                                                0
<TOTAL-COSTS>                                  124,360
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                 11,065
<INCOME-TAX>                                     3,538
<INCOME-CONTINUING>                              7,527
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,527
<EPS-PRIMARY>                                      .15
<EPS-DILUTED>                                        0