<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               JUN-30-1997             JUN-30-1996
<CASH>                                         218,497                 138,398
<SECURITIES>                                    21,571                       0
<RECEIVABLES>                                   74,050                 123,085
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               325,150                 266,261
<PP&E>                                          53,409                  47,719
<DEPRECIATION>                                  35,353                  30,959
<TOTAL-ASSETS>                                 351,117                 286,721
<CURRENT-LIABILITIES>                           82,647                  34,596
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           466                     464
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITY-AND-EQUITY>                   351,117                 286,721
<SALES>                                              0                       0
<TOTAL-REVENUES>                                68,855                  59,672
<CGS>                                                0                       0
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                                46,111                  38,846
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             (4,413)                       0
<INCOME-PRETAX>                                 27,157                  20,826
<INCOME-TAX>                                    11,224                   8,602
<INCOME-CONTINUING>                             15,933                  12,224
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    15,933                  12,224
<EPS-PRIMARY>                                      .34                       0
<EPS-DILUTED>                                      .34                       0