<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10-K as
of December 31, 1996 and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                               0
<SECURITIES>                                         0
<RECEIVABLES>                                   85,150<F1>
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               150,482
<PP&E>                                         574,659
<DEPRECIATION>                               (171,878)
<TOTAL-ASSETS>                                 949,986
<CURRENT-LIABILITIES>                          213,421
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           774
<OTHER-SE>                                     430,687
<TOTAL-LIABILITY-AND-EQUITY>                   949,986
<SALES>                                              0
<TOTAL-REVENUES>                             1,102,992
<CGS>                                                0
<TOTAL-COSTS>                                  642,299
<OTHER-EXPENSES>                               316,930
<LOSS-PROVISION>                                     0 
<INTEREST-EXPENSE>                              28,764
<INCOME-PRETAX>                                114,999
<INCOME-TAX>                                    40,249
<INCOME-CONTINUING>                             74,750
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    74,750
<EPS-PRIMARY>                                     0.86
<EPS-DILUTED>                                     0.86
<FN>
<F1>Trade Accounts Receivable, Less Allowance for Doubtful Accounts
</FN>