<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Item 1 of
Form 10-Q for the period ended September 30, 1997 and is qualified in its
entirety by reference to such 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          57,286
<SECURITIES>                                    65,006
<RECEIVABLES>                                    9,256
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               133,518
<PP&E>                                          47,102
<DEPRECIATION>                                  16,582
<TOTAL-ASSETS>                                 181,058
<CURRENT-LIABILITIES>                           39,498
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            12
<OTHER-SE>                                     141,124
<TOTAL-LIABILITY-AND-EQUITY>                   181,058
<SALES>                                              0
<TOTAL-REVENUES>                                61,714
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                48,975
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  6,281
<INCOME-TAX>                                       314
<INCOME-CONTINUING>                              5,967
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,967
<EPS-PRIMARY>                                      .25
<EPS-DILUTED>                                      .25