<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FORM 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-31-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                           1,214
<SECURITIES>                                    22,324
<RECEIVABLES>                                   74,370
<ALLOWANCES>                                       988
<INVENTORY>                                     16,164
<CURRENT-ASSETS>                               119,328
<PP&E>                                         476,943
<DEPRECIATION>                                 204,843
<TOTAL-ASSETS>                                 463,907
<CURRENT-LIABILITIES>                           88,428
<BONDS>                                        170,802
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,091
<OTHER-SE>                                     145,867
<TOTAL-LIABILITY-AND-EQUITY>                   463,907
<SALES>                                         17,199
<TOTAL-REVENUES>                                82,748
<CGS>                                           12,570
<TOTAL-COSTS>                                   54,712
<OTHER-EXPENSES>                                18,387
<LOSS-PROVISION>                                    26
<INTEREST-EXPENSE>                               2,767
<INCOME-PRETAX>                                  8,092
<INCOME-TAX>                                     3,052
<INCOME-CONTINUING>                              5,040
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,040
<EPS-PRIMARY>                                      .21
<EPS-DILUTED>                                      .21