<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          39,321
<SECURITIES>                                         0
<RECEIVABLES>                                   15,275
<ALLOWANCES>                                     1,113
<INVENTORY>                                     53,696
<CURRENT-ASSETS>                                     0
<PP&E>                                         369,731
<DEPRECIATION>                                  72,552
<TOTAL-ASSETS>                                 420,145
<CURRENT-LIABILITIES>                                0
<BONDS>                                        105,055
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                     180,764
<TOTAL-LIABILITY-AND-EQUITY>                   420,145
<SALES>                                        149,650
<TOTAL-REVENUES>                               173,061
<CGS>                                           99,254
<TOTAL-COSTS>                                  115,604
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,656
<INCOME-PRETAX>                                 45,998
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                             45,998
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    45,998
<EPS-PRIMARY>                                     1.33
<EPS-DILUTED>                                     1.31