<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           3,926
<SECURITIES>                                   125,085
<RECEIVABLES>                                   39,982
<ALLOWANCES>                                     1,362
<INVENTORY>                                      9,534
<CURRENT-ASSETS>                                63,251
<PP&E>                                         267,851
<DEPRECIATION>                                 110,722
<TOTAL-ASSETS>                                 424,784
<CURRENT-LIABILITIES>                           30,507
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        10,678
<OTHER-SE>                                     251,023
<TOTAL-LIABILITY-AND-EQUITY>                   424,784
<SALES>                                         58,300
<TOTAL-REVENUES>                                59,398
<CGS>                                           39,720
<TOTAL-COSTS>                                   39,720
<OTHER-EXPENSES>                                15,601
<LOSS-PROVISION>                                   235
<INTEREST-EXPENSE>                               1,049
<INCOME-PRETAX>                                  2,793
<INCOME-TAX>                                       803
<INCOME-CONTINUING>                              1,990
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,990
<EPS-PRIMARY>                                      .23
<EPS-DILUTED>                                      .23