<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Item 1 of
Form 10-Q for the period ended March 31, 1998 and is qualified in its entirety
by reference to such 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          42,726
<SECURITIES>                                    89,713
<RECEIVABLES>                                    8,903
<ALLOWANCES>                                       277
<INVENTORY>                                          0
<CURRENT-ASSETS>                               152,190
<PP&E>                                          66,774
<DEPRECIATION>                                  23,405
<TOTAL-ASSETS>                                 219,097
<CURRENT-LIABILITIES>                           66,740
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            27
<OTHER-SE>                                     151,404
<TOTAL-LIABILITY-AND-EQUITY>                   219,097
<SALES>                                              0
<TOTAL-REVENUES>                                30,379
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                27,470
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  4,146
<INCOME-TAX>                                       580
<INCOME-CONTINUING>                              3,566
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,566
<EPS-PRIMARY>                                     0.13
<EPS-DILUTED>                                     0.12