<ARTICLE> 5
<MULTIPLIER> 1000

       

                                                                 
<PERIOD-TYPE>                                                       6-MOS
<FISCAL-YEAR-END>                                                   DEC-31-1997
<PERIOD-END>                                                        JUN-30-1997
<CASH>                                                                    4,652
<SECURITIES>                                                             58,263
<RECEIVABLES>                                                            47,692
<ALLOWANCES>                                                              1,469
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<CURRENT-ASSETS>                                                        166,791
<PP&E>                                                                  214,902
<DEPRECIATION>                                                          150,081
<TOTAL-ASSETS>                                                          278,504
<CURRENT-LIABILITIES>                                                    46,339
<BONDS>                                                                  10,347
<PREFERRED-MANDATORY>                                                         0
<PREFERRED>                                                                   0
<COMMON>                                                                 10,000
<OTHER-SE>                                                              181,163
<TOTAL-LIABILITY-AND-EQUITY>                                            278,504
<SALES>                                                                 107,560
<TOTAL-REVENUES>                                                        111,149
<CGS>                                                                    71,791
<TOTAL-COSTS>                                                            92,300
<OTHER-EXPENSES>                                                            251
<LOSS-PROVISION>                                                            100
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<INCOME-TAX>                                                              6,404
<INCOME-CONTINUING>                                                      12,005
<DISCONTINUED>                                                                0
<EXTRAORDINARY>                                                               0
<CHANGES>                                                                     0
<NET-INCOME>                                                             12,005
<EPS-PRIMARY>                                                              2.36
<EPS-DILUTED>                                                              2.36