WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

                                                                    Exhibit 27

<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<EXCHANGE-RATE>                                1.00000
<CASH>                                          42,532
<SECURITIES>                                    31,497
<RECEIVABLES>                                   53,713
<ALLOWANCES>                                         0
<INVENTORY>                                     25,639
<CURRENT-ASSETS>                               164,648
<PP&E>                                         234,762
<DEPRECIATION>                                (74,710)
<TOTAL-ASSETS>                                 530,097
<CURRENT-LIABILITIES>                          114,235
<BONDS>                                        153,359
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         2,515
<OTHER-SE>                                     165,412
<TOTAL-LIABILITY-AND-EQUITY>                   530,097
<SALES>                                              0
<TOTAL-REVENUES>                                69,710
<CGS>                                                0
<TOTAL-COSTS>                                   61,499
<OTHER-EXPENSES>                               (7,356)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,614
<INCOME-PRETAX>                                 13,953
<INCOME-TAX>                                     6,644
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,309
<EPS-PRIMARY>                                    0.290
<EPS-DILUTED>                                    0.290