<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM CONDENSED
CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF EARNINGS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                           2,729
<SECURITIES>                                    18,154
<RECEIVABLES>                                   81,081
<ALLOWANCES>                                       702
<INVENTORY>                                     16,585
<CURRENT-ASSETS>                               134,060
<PP&E>                                         524,204
<DEPRECIATION>                                 208,010
<TOTAL-ASSETS>                                 522,086
<CURRENT-LIABILITIES>                           91,107
<BONDS>                                        177,517
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,091
<OTHER-SE>                                     196,957
<TOTAL-LIABILITY-AND-EQUITY>                   522,086
<SALES>                                         17,376
<TOTAL-REVENUES>                                98,915
<CGS>                                           12,099
<TOTAL-COSTS>                                   67,199
<OTHER-EXPENSES>                                21,943
<LOSS-PROVISION>                                     1
<INTEREST-EXPENSE>                               3,374
<INCOME-PRETAX>                                  7,663
<INCOME-TAX>                                     2,924
<INCOME-CONTINUING>                              4,739
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,739
<EPS-PRIMARY>                                      .19
<EPS-DILUTED>                                      .19