<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> JUN-30-1997 <CASH> 11,432 <SECURITIES> 6,728 <RECEIVABLES> 40,605 <ALLOWANCES> 6,864 <INVENTORY> 14,494 <CURRENT-ASSETS> 75,172 <PP&E> 201,331 <DEPRECIATION> 147,558 <TOTAL-ASSETS> 169,622 <CURRENT-LIABILITIES> 35,402 <BONDS> 1,402 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 1,478 <OTHER-SE> 126,739 <TOTAL-LIABILITY-AND-EQUITY> 169,622 <SALES> 0 <TOTAL-REVENUES> 125,235 <CGS> 47,383 <TOTAL-COSTS> 104,828 <OTHER-EXPENSES> 5,896 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 15,601 <INCOME-TAX> 5,382 <INCOME-CONTINUING> 10,219 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 10,219 <EPS-PRIMARY> 0.70 <EPS-DILUTED> 0.70