<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                       
<PERIOD-TYPE>                                    3-MOS                  12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996<F1>         DEC-31-1996
<PERIOD-START>                             APR-01-1996             JAN-01-1996
<PERIOD-END>                               JUN-30-1996             DEC-31-1996
<CASH>                                          40,395                  14,539
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   34,644                  73,274
<ALLOWANCES>                                         0                      29
<INVENTORY>                                        690                     947
<CURRENT-ASSETS>                                76,790                  89,687
<PP&E>                                         517,029                 681,900
<DEPRECIATION>                                 169,363                 194,642
<TOTAL-ASSETS>                                 424,456                 576,945
<CURRENT-LIABILITIES>                           41,681                  78,317
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           310                     313
<OTHER-SE>                                     348,607                 377,407
<TOTAL-LIABILITY-AND-EQUITY>                   424,456                 576,945
<SALES>                                         45,906                 198,599
<TOTAL-REVENUES>                                47,405                 202,572
<CGS>                                           20,860                  93,417
<TOTAL-COSTS>                                   31,720                 137,453
<OTHER-EXPENSES>                                 3,448                  16,947
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               1,586                   3,684
<INCOME-PRETAX>                                 10,651                  44,488
<INCOME-TAX>                                     4,046                  14,962
<INCOME-CONTINUING>                              6,605                  29,526
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     6,605                  29,526
<EPS-PRIMARY>                                      .26                    1.04
<EPS-DILUTED>                                      .25                    1.02
<FN>
<F1>No changes were noted for three months ended 3/31/96 nor the three months ended
9/30/96.
</FN>