<ARTICLE> 5
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE COMPANY'S
CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               MAR-31-1996
<CASH>                                          51,751
<SECURITIES>                                         0
<RECEIVABLES>                                   34,287
<ALLOWANCES>                                         0
<INVENTORY>                                      6,205
<CURRENT-ASSETS>                               100,747
<PP&E>                                         519,607
<DEPRECIATION>                               (175,517)
<TOTAL-ASSETS>                                 523,553
<CURRENT-LIABILITIES>                           61,303
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           313
<OTHER-SE>                                     236,414
<TOTAL-LIABILITY-AND-EQUITY>                   523,553
<SALES>                                        120,650
<TOTAL-REVENUES>                               120,650
<CGS>                                                0
<TOTAL-COSTS>                                  106,266
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,618
<INCOME-PRETAX>                                 10,746
<INCOME-TAX>                                     4,298
<INCOME-CONTINUING>                              6,448
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,448
<EPS-PRIMARY>                                     0.21
<EPS-DILUTED>                                     0.21