<ARTICLE>                     5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
     THE COMPANY'S INTERIM UNAUDITED FINANCIAL STATEMENTS FOR THE SIX
     MONTHS ENDED JUNE 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
     TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                    1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>               DEC-31-1997
<PERIOD-END>                    JUN-30-1997
<CASH>                                 3829
<SECURITIES>                          13053
<RECEIVABLES>                         10460
<ALLOWANCES>                              0
<INVENTORY>                            8461
<CURRENT-ASSETS>                      41462
<PP&E>                               239458
<DEPRECIATION>                        48004
<TOTAL-ASSETS>                       235771
<CURRENT-LIABILITIES>                 12996
<BONDS>                               62593
<PREFERRED-MANDATORY>                     0
<PREFERRED>                               0
<COMMON>                                203
<OTHER-SE>                           142091
<TOTAL-LIABILITY-AND-EQUITY>         235771
<SALES>                              38295
<TOTAL-REVENUES>                     38295
<CGS>                                32723
<TOTAL-COSTS>                        41549
<OTHER-EXPENSES>                         0
<LOSS-PROVISION>                         0
<INTEREST-EXPENSE>                    1936
<INCOME-PRETAX>                      (4663)
<INCOME-TAX>                          1795
<INCOME-CONTINUING>                  (2868)
<DISCONTINUED>                           0
<EXTRAORDINARY>                          0
<CHANGES>                                0
<NET-INCOME>                         (2868)
<EPS-PRIMARY>                        (0.14)
<EPS-DILUTED>                        (0.10)