<TABLE> <S> <C>

<ARTICLE> 5

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998             DEC-31-1997
<PERIOD-END>                               DEC-31-1999             DEC-31-1998             DEC-31-1997
<CASH>                                           4,664                  12,576                  15,619
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   29,332                  23,176                  46,680
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                        402                     579                     456
<CURRENT-ASSETS>                                55,393                  39,621                  72,347
<PP&E>                                         705,351                 500,510                 310,122
<DEPRECIATION>                                  97,511                  68,881                  49,635
<TOTAL-ASSETS>                                 666,142                 475,684                 334,182
<CURRENT-LIABILITIES>                           24,577                  32,922                  16,875
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           572                     524                     519
<OTHER-SE>                                     412,173                 361,064                 295,223
<TOTAL-LIABILITY-AND-EQUITY>                   666,142                 475,684                 334,182
<SALES>                                        115,406                 228,015                 190,257
<TOTAL-REVENUES>                               115,406                 228,015                 190,257
<CGS>                                           77,591                 102,166                  77,847
<TOTAL-COSTS>                                   77,591                 102,166                  77,847
<OTHER-EXPENSES>                                29,569                  20,191                  16,995
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                             (6,184)                     481                     575
<INCOME-PRETAX>                                (8,482)                  95,541                  89,836
<INCOME-TAX>                                   (2,352)                  34,720                  31,456
<INCOME-CONTINUING>                            (6,130)                  60,821                  58,380
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                   (6,130)                  60,821                  58,380
<EPS-BASIC>                                     (0.11)                    1.16                    1.13
<EPS-DILUTED>                                   (0.11)                    1.15                    1.11


</TABLE>