<ARTICLE> 5
<LEGEND>
This schedule contains financial information extracted fro SEC filing form 
10-Q and is qualified in its entirety by reference to such financial 
statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                        
<PERIOD-TYPE>              6-MOS
<FISCAL-YEAR-END>                       DEC-31-1996
<PERIOD-START>                          JAN-01-1996
<PERIOD-END>                            JUN-30-1996
<CASH>                                        5,069
<SECURITIES>                                      0
<RECEIVABLES>                                73,510
<ALLOWANCES>                                 (2,558)
<INVENTORY>                                   8,153
<CURRENT-ASSETS>                             96,312
<PP&E>                                      566,716  
<DEPRECIATION>                             (217,774)
<TOTAL-ASSETS>                              882,134
<CURRENT-LIABILITIES>                        93,725  
<BONDS>                                           0
<COMMON>                                        300
<PREFERRED-MANDATORY>                             0
<PREFERRED>                                       0
<OTHER-SE>                                  476,624
<TOTAL-LIABILITY-AND-EQUITY>                882,134
<SALES>                                     303,222
<TOTAL-REVENUES>                            303,222
<CGS>                                             0
<TOTAL-COSTS>                               270,930
<OTHER-EXPENSES>                             (2,309)
<LOSS-PROVISION>                                  0
<INTEREST-EXPENSE>                            6,952 
<INCOME-PRETAX>                              27,649   
<INCOME-TAX>                                 12,058  
<INCOME-CONTINUING>                          15,591       
<DISCONTINUED>                                    0
<EXTRAORDINARY>                                   0
<CHANGES>                                         0
<NET-INCOME>                                 15,591
<EPS-PRIMARY>                                   .52
<EPS-DILUTED>                                   .52