<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   6-MOS                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1997
<PERIOD-START>                             JAN-01-1996             APR-01-1996             JAN-01-1996             JAN-01-1997
<PERIOD-END>                               MAR-31-1996             JUN-30-1996             JUN-30-1996             DEC-31-1997
<CASH>                                          31,275                  36,585                  36,585                  44,346
<SECURITIES>                                    95,558                  81,476                  81,476                 160,866
<RECEIVABLES>                                        0                       0                       0                       0
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                               129,658                 131,727                 131,727                 207,332
<PP&E>                                          26,190                  27,834                  27,834                  37,378
<DEPRECIATION>                                   8,789                   9,719                   9,719                  16,731
<TOTAL-ASSETS>                                 150,085                 152,875                 152,875                 236,332
<CURRENT-LIABILITIES>                            7,441                   7,346                   7,346                  10,420
<BONDS>                                          3,986                   3,769                   3,769                   2,668
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                           186                     187                     187                     223
<OTHER-SE>                                     138,108                 141,185                 141,185                 223,031
<TOTAL-LIABILITY-AND-EQUITY>                   150,085                 152,875                 152,875                 236,232
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                13,934                  13,060                  26,984                  25,605
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                        0                       0                       0                  57,253
<OTHER-EXPENSES>                                 9,012                   9,491                  18,503                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                 108                     103                     211                     389
<INCOME-PRETAX>                                  4,377                   2,680                   7,057                (21,148)
<INCOME-TAX>                                        90                      51                     141                     245
<INCOME-CONTINUING>                              4,287                   2,629                   6,916                (21,393)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     4,287                   2,629                   6,916                (21,393)
<EPS-PRIMARY>                                     0.23                    0.14                    0.37                  (0.99)
<EPS-DILUTED>                                     0.22                    0.13                    0.35                  (0.99)
        

</TABLE>