<ARTICLE> 5
<LEGEND>
This schedule contains financial information extracted from SEC filing Form 10-K
and is qualified in its entirety by reference to such financial statements.

</LEGEND>
       
                                        
<PERIOD-TYPE>                                    3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                           7,323   
<SECURITIES>                                         0
<RECEIVABLES>                                   74,478
<ALLOWANCES>                                   (2,264)
<INVENTORY>                                      7,670
<CURRENT-ASSETS>                               103,760
<PP&E>                                         568,460
<DEPRECIATION>                               (231,031)
<TOTAL-ASSETS>                                 857,988
<CURRENT-LIABILITIES>                           97,471
<BONDS>                                              0
<COMMON>                                           378
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     516,423
<TOTAL-LIABILITY-AND-EQUITY>                   857,988
<SALES>                                        150,621
<TOTAL-REVENUES>                               150,621
<CGS>                                                0
<TOTAL-COSTS>                                  127,831
<OTHER-EXPENSES>                               (6,297)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,668
<INCOME-PRETAX>                                 26,419 
<INCOME-TAX>                                    11,062
<INCOME-CONTINUING>                             15,357
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,357
<EPS-PRIMARY>                                     0.40
<EPS-DILUTED>                                     0.40