<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                              <C>                   
<PERIOD-TYPE>                   YEAR                   YEAR                              YEAR                  
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996                  DEC-31-1995
<PERIOD-START>                             JAN-01-1997             JAN-01-1996                  JAN-01-1995
<PERIOD-END>                               DEC-31-1997             DEC-31-1996                  DEC-31-1995
<CASH>                                           3,213                 224,325                            0
<SECURITIES>                                         0                       0                            0
<RECEIVABLES>                                    3,651                   1,665                            0
<ALLOWANCES>                                         0                       0                            0 
<INVENTORY>                                          0                       0                            0
<CURRENT-ASSETS>                                19,058                 229,509                            0
<PP&E>                                       1,074,365                 441,152                            0
<DEPRECIATION>                                  32,188                  12,403                            0
<TOTAL-ASSETS>                               1,070,891                 668,435                            0
<CURRENT-LIABILITIES>                           82,839                  31,738                            0
<BONDS>                                              0                       0                            0
<PREFERRED-MANDATORY>                                0                       0                            0
<PREFERRED>                                          0                       0                            0
<COMMON>                                           956                     837                            0
<OTHER-SE>                                     833,703                 627,877                            0
<TOTAL-LIABILITY-AND-EQUITY>                 1,070,891                 668,435                            0
<SALES>                                              0                       0                            0
<TOTAL-REVENUES>                               130,800                  38,809                       16,768    
<CGS>                                                0                       0                            0
<TOTAL-COSTS>                                   60,391                  16,560                        6,706
<OTHER-EXPENSES>                                71,177                  23,006                        6,728   
<LOSS-PROVISION>                                     0                       0                            0
<INTEREST-EXPENSE>                                   0                       0                          507
<INCOME-PRETAX>                                  8,474                  12,987                        2,685
<INCOME-TAX>                                     5,838                   5,231                        1,217
<INCOME-CONTINUING>                              2,636                   7,756                        1,468   
<DISCONTINUED>                                       0                       0                            0
<EXTRAORDINARY>                                      0                       0                         (185)   
<CHANGES>                                            0                       0                            0
<NET-INCOME>                                     2,636                   7,756                        1,283   
<EPS-PRIMARY>                                     0.03                    0.11                            0 
<EPS-DILUTED>                                     0.03                    0.10                            0
        

</TABLE>