<ARTICLE> 5
<MULTIPLIER> 1,000

                                                          
<PERIOD-TYPE>                                    3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1999
<PERIOD-START>                             APR-01-1999             JAN-01-1999
<PERIOD-END>                               JUN-30-1999             JUN-30-1999
<CASH>                                           3,125                   3,125
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   23,816                  23,816
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      9,621                   9,621
<CURRENT-ASSETS>                                42,025                  42,025
<PP&E>                                         400,871                 400,871
<DEPRECIATION>                                 (70,216)                (70,216)
<TOTAL-ASSETS>                                 377,190                 377,190
<CURRENT-LIABILITIES>                           28,680                  28,680
<BONDS>                                         18,558                  18,558
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           377                     377
<OTHER-SE>                                     299,663                 299,663
<TOTAL-LIABILITY-AND-EQUITY>                   377,190                 377,190
<SALES>                                         36,845                  74,875
<TOTAL-REVENUES>                                36,845                  74,875
<CGS>                                           21,168                  39,399
<TOTAL-COSTS>                                   25,716                  48,202
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  28                     137
<INCOME-PRETAX>                                 11,281                  27,203
<INCOME-TAX>                                    (3,235)                 (8,569)
<INCOME-CONTINUING>                              8,046                  18,634
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     8,046                  18,634
<EPS-BASIC>                                       0.22                    0.52
<EPS-DILUTED>                                     0.21                    0.48